Suspension (vehicle)
This article is about four-wheeled vehicle suspension. For information on two wheeled vehicles' suspensions see Suspension, Motorcycle fork, Bicycle suspension, Bicycle fork. Suspension is the system of tires, tire air, shock absorbers and linkages that connects a vehicle to its wheels and allows relative motion between the two. Suspension systems must support both road holding/handling and ride quality, which are at odds with each other; the tuning of suspensions involves finding the right compromise. It is important for the suspension to keep the road wheel in contact with the road surface as much as possible, because all the road or ground forces acting on the vehicle do so through the contact patches of the tires; the suspension protects the vehicle itself and any cargo or luggage from damage and wear. The design of front and rear suspension of a car may be different. An early form of suspension on ox-drawn carts had the platform swing on iron chains attached to the wheeled frame of the carriage.
This system remained the basis for all suspension systems until the turn of the 19th century, although the iron chains were replaced with the use of leather straps by the 17th century. No modern automobiles use the'strap suspension' system. Automobiles were developed as self-propelled versions of horse-drawn vehicles. However, horse-drawn vehicles had been designed for slow speeds, their suspension was not well suited to the higher speeds permitted by the internal combustion engine; the first workable spring-suspension required advanced metallurgical knowledge and skill, only became possible with the advent of industrialisation. Obadiah Elliott registered the first patent for a spring-suspension vehicle. Within a decade, most British horse carriages were equipped with springs; these were made of low-carbon steel and took the form of multiple layer leaf springs. Leaf springs have been around since the early Egyptians. Ancient military engineers used leaf springs in the form of bows to power their siege engines, with little success at first.
The use of leaf springs in catapults was refined and made to work years later. Springs were not only made of metal. Horse-drawn carriages and the Ford Model T used this system, it is still used today in larger vehicles mounted in the rear suspension. Leaf springs were the first modern suspension system and, along with advances in the construction of roads, heralded the single greatest improvement in road transport until the advent of the automobile; the British steel springs were not well-suited for use on America's rough roads of the time, so the Abbot-Downing Company of Concord, New Hampshire re-introduced leather strap suspension, which gave a swinging motion instead of the jolting up and down of a spring suspension. In 1901 Mors of Paris first fitted an automobile with shock absorbers. With the advantage of a damped suspension system on his'Mors Machine', Henri Fournier won the prestigious Paris-to-Berlin race on 20 June 1901. Fournier's superior time was 11 hrs 46 min 10 sec, while the best competitor was Léonce Girardot in a Panhard with a time of 12 hrs 15 min 40 sec.
Coil springs first appeared on a production vehicle in 1906 in the Brush Runabout made by the Brush Motor Company. Today, coil springs are used in most cars. In 1920, Leyland Motors used torsion bars in a suspension system. In 1922, independent front suspension was pioneered on the Lancia Lambda and became more common in mass market cars from 1932. Today, most cars have independent suspension on all four wheels. In 2002, a new passive suspension component was invented by Malcolm C. Smith, the inerter; this has the ability to increase the effective inertia of a wheel suspension using a geared flywheel, but without adding significant mass. It was employed in Formula One in secrecy but has since spread to other motorsport. Any four wheel vehicle needs suspension for both the front wheels and the rear suspension, but in two wheel drive vehicles there can be a different configuration. For front-wheel drive cars, rear suspension has few constraints and a variety of beam axles and independent suspensions are used.
For rear-wheel drive cars, rear suspension has many constraints and the development of the superior but more expensive independent suspension layout has been difficult. Four-wheel drive has suspensions that are similar for both the front and rear wheels. Henry Ford's Model T used a torque tube to restrain this force, for his differential was attached to the chassis by a lateral leaf spring and two narrow rods; the torque tube surrounded the true driveshaft and exerted the force to its ball joint at the extreme rear of the transmission, attached to the engine. A similar method was used in the late 1930s by Buick and by Hudson's bathtub car in 1948, which used helical springs which could not take fore-and-aft thrust; the Hotchkiss drive, invented by Albert Hotchkiss, was the most popular rear suspension system used in American cars from the 1930s to the 1970s. The system uses longitudinal leaf springs attached both forward and behind the differential of the live axle; these springs transmit the torque to the frame.
Although scorned by many European car makers of the time, it was accepted by American car makers because it was inexpensive to manufacture. The dynamic defects of this design were suppressed by the enormous weight of US passenger vehicles before implementation of the Corporate Average Fuel Economy
United Kingdom
The United Kingdom the United Kingdom of Great Britain and Northern Ireland, sometimes referred to as Britain, is a sovereign country located off the north-western coast of the European mainland. The United Kingdom includes the island of Great Britain, the north-eastern part of the island of Ireland, many smaller islands. Northern Ireland is the only part of the United Kingdom that shares a land border with another sovereign state, the Republic of Ireland. Apart from this land border, the United Kingdom is surrounded by the Atlantic Ocean, with the North Sea to the east, the English Channel to the south and the Celtic Sea to the south-west, giving it the 12th-longest coastline in the world; the Irish Sea lies between Great Ireland. With an area of 242,500 square kilometres, the United Kingdom is the 78th-largest sovereign state in the world, it is the 22nd-most populous country, with an estimated 66.0 million inhabitants in 2017. The UK is constitutional monarchy; the current monarch is Queen Elizabeth II, who has reigned since 1952, making her the longest-serving current head of state.
The United Kingdom's capital and largest city is London, a global city and financial centre with an urban area population of 10.3 million. Other major urban areas in the UK include Greater Manchester, the West Midlands and West Yorkshire conurbations, Greater Glasgow and the Liverpool Built-up Area; the United Kingdom consists of four constituent countries: England, Scotland and Northern Ireland. Their capitals are London, Edinburgh and Belfast, respectively. Apart from England, the countries have their own devolved governments, each with varying powers, but such power is delegated by the Parliament of the United Kingdom, which may enact laws unilaterally altering or abolishing devolution; the nearby Isle of Man, Bailiwick of Guernsey and Bailiwick of Jersey are not part of the UK, being Crown dependencies with the British Government responsible for defence and international representation. The medieval conquest and subsequent annexation of Wales by the Kingdom of England, followed by the union between England and Scotland in 1707 to form the Kingdom of Great Britain, the union in 1801 of Great Britain with the Kingdom of Ireland created the United Kingdom of Great Britain and Ireland.
Five-sixths of Ireland seceded from the UK in 1922, leaving the present formulation of the United Kingdom of Great Britain and Northern Ireland. There are fourteen British Overseas Territories, the remnants of the British Empire which, at its height in the 1920s, encompassed a quarter of the world's land mass and was the largest empire in history. British influence can be observed in the language and political systems of many of its former colonies; the United Kingdom is a developed country and has the world's fifth-largest economy by nominal GDP and ninth-largest economy by purchasing power parity. It has a high-income economy and has a high Human Development Index rating, ranking 14th in the world, it was the world's first industrialised country and the world's foremost power during the 19th and early 20th centuries. The UK remains a great power, with considerable economic, military and political influence internationally, it is sixth in military expenditure in the world. It has been a permanent member of the United Nations Security Council since its first session in 1946.
It has been a leading member state of the European Union and its predecessor, the European Economic Community, since 1973. The United Kingdom is a member of the Commonwealth of Nations, the Council of Europe, the G7, the G20, NATO, the Organisation for Economic Co-operation and Development and the World Trade Organization; the 1707 Acts of Union declared that the kingdoms of England and Scotland were "United into One Kingdom by the Name of Great Britain". The term "United Kingdom" has been used as a description for the former kingdom of Great Britain, although its official name from 1707 to 1800 was "Great Britain"; the Acts of Union 1800 united the kingdom of Great Britain and the kingdom of Ireland in 1801, forming the United Kingdom of Great Britain and Ireland. Following the partition of Ireland and the independence of the Irish Free State in 1922, which left Northern Ireland as the only part of the island of Ireland within the United Kingdom, the name was changed to the "United Kingdom of Great Britain and Northern Ireland".
Although the United Kingdom is a sovereign country, Scotland and Northern Ireland are widely referred to as countries. The UK Prime Minister's website has used the phrase "countries within a country" to describe the United Kingdom; some statistical summaries, such as those for the twelve NUTS 1 regions of the United Kingdom refer to Scotland and Northern Ireland as "regions". Northern Ireland is referred to as a "province". With regard to Northern Ireland, the descriptive name used "can be controversial, with the choice revealing one's political preferences"; the term "Great Britain" conventionally refers to the island of Great Britain, or politically to England and Wales in combination. However, it is sometimes used as a loose synonym for the United Kingdom as a whole; the term "Britain" is used both as a synonym for Great Britain, as a synonym for the United Kingdom. Usage is mixed, with the BBC preferring to use Britain as shorthand only for Great Britain and the UK Government, while accepting that both terms refer to the United K
South Africa
South Africa the Republic of South Africa, is the southernmost country in Africa. It is bounded to the south by 2,798 kilometres of coastline of Southern Africa stretching along the South Atlantic and Indian Oceans. South Africa is the largest country in Southern Africa and the 25th-largest country in the world by land area and, with over 57 million people, is the world's 24th-most populous nation, it is the southernmost country on the mainland of the Eastern Hemisphere. About 80 percent of South Africans are of Sub-Saharan African ancestry, divided among a variety of ethnic groups speaking different African languages, nine of which have official status; the remaining population consists of Africa's largest communities of European and multiracial ancestry. South Africa is a multiethnic society encompassing a wide variety of cultures and religions, its pluralistic makeup is reflected in the constitution's recognition of 11 official languages, the fourth highest number in the world. Two of these languages are of European origin: Afrikaans developed from Dutch and serves as the first language of most coloured and white South Africans.
The country is one of the few in Africa never to have had a coup d'état, regular elections have been held for a century. However, the vast majority of black South Africans were not enfranchised until 1994. During the 20th century, the black majority sought to recover its rights from the dominant white minority, with this struggle playing a large role in the country's recent history and politics; the National Party imposed apartheid in 1948. After a long and sometimes violent struggle by the African National Congress and other anti-apartheid activists both inside and outside the country, the repeal of discriminatory laws began in 1990. Since 1994, all ethnic and linguistic groups have held political representation in the country's liberal democracy, which comprises a parliamentary republic and nine provinces. South Africa is referred to as the "rainbow nation" to describe the country's multicultural diversity in the wake of apartheid; the World Bank classifies South Africa as an upper-middle-income economy, a newly industrialised country.
Its economy is the second-largest in Africa, the 34th-largest in the world. In terms of purchasing power parity, South Africa has the seventh-highest per capita income in Africa; however and inequality remain widespread, with about a quarter of the population unemployed and living on less than US$1.25 a day. South Africa has been identified as a middle power in international affairs, maintains significant regional influence; the name "South Africa" is derived from the country's geographic location at the southern tip of Africa. Upon formation, the country was named the Union of South Africa in English, reflecting its origin from the unification of four separate British colonies. Since 1961, the long form name in English has been the "Republic of South Africa". In Dutch, the country was named Republiek van Zuid-Afrika, replaced in 1983 by the Afrikaans Republiek van Suid-Afrika. Since 1994, the Republic has had an official name in each of its 11 official languages. Mzansi, derived from the Xhosa noun umzantsi meaning "south", is a colloquial name for South Africa, while some Pan-Africanist political parties prefer the term "Azania".
South Africa contains human-fossil sites in the world. Archaeologists have recovered extensive fossil remains from a series of caves in Gauteng Province; the area, a UNESCO World Heritage site, has been branded "the Cradle of Humankind". The sites include one of the richest sites for hominin fossils in the world. Other sites include Gondolin Cave Kromdraai, Coopers Cave and Malapa. Raymond Dart identified the first hominin fossil discovered in Africa, the Taung Child in 1924. Further hominin remains have come from the sites of Makapansgat in Limpopo Province and Florisbad in the Free State Province, Border Cave in KwaZulu-Natal Province, Klasies River Mouth in Eastern Cape Province and Pinnacle Point and Die Kelders Cave in Western Cape Province; these finds suggest that various hominid species existed in South Africa from about three million years ago, starting with Australopithecus africanus. There followed species including Australopithecus sediba, Homo ergaster, Homo erectus, Homo rhodesiensis, Homo helmei, Homo naledi and modern humans.
Modern humans have inhabited Southern Africa for at least 170,000 years. Various researchers have located pebble tools within the Vaal River valley. Settlements of Bantu-speaking peoples, who were iron-using agriculturists and herdsmen, were present south of the Limpopo River by the 4th or 5th century CE, they displaced and absorbed the original Khoisan speakers, the Khoikhoi and San peoples. The Bantu moved south; the earliest ironworks in modern-day KwaZulu-Natal Province are believed to date from around 1050. The southernmost group was the Xhosa people, whose language incorporates certain linguistic traits from the earlier Khoisan people; the Xhosa reached the Great Fish River, in today's Eastern Cape Province. As they migrated, these larger Iron Age populations
Quebec
Quebec is one of the thirteen provinces and territories of Canada. It is bordered to the west by the province of Ontario and the bodies of water James Bay and Hudson Bay. S. states of Maine, New Hampshire and New York. It shares maritime borders with Nunavut, Prince Edward Island, Nova Scotia. Quebec is Canada's largest province by its second-largest administrative division, it is and politically considered to be part of Central Canada. Quebec is the second-most populous province of Canada, after Ontario, it is the only one to have a predominantly French-speaking population, with French as the sole provincial official language. Most inhabitants live in urban areas near the Saint Lawrence River between Montreal and Quebec City, the capital. Half of Quebec residents live in the Greater Montreal Area, including the Island of Montreal. English-speaking communities and English-language institutions are concentrated in the west of the island of Montreal but are significantly present in the Outaouais, Eastern Townships, Gaspé regions.
The Nord-du-Québec region, occupying the northern half of the province, is sparsely populated and inhabited by Aboriginal peoples. The climate around the major cities is four-seasons continental with cold and snowy winters combined with warm to hot humid summers, but farther north long winter seasons dominate and as a result the northern areas of the province are marked by tundra conditions. In central Quebec, at comparatively southerly latitudes, winters are severe in inland areas. Quebec independence debates have played a large role in the politics of the province. Parti Québécois governments held referendums on sovereignty in 1980 and 1995. Although neither passed, the 1995 referendum saw the highest voter turnout in Quebec history, at over 93%, only failed by less than 1%. In 2006, the House of Commons of Canada passed a symbolic motion recognizing the "Québécois as a nation within a united Canada". While the province's substantial natural resources have long been the mainstay of its economy, sectors of the knowledge economy such as aerospace and communication technologies and the pharmaceutical industry play leading roles.
These many industries have all contributed to helping Quebec become an economically influential province within Canada, second only to Ontario in economic output. The name "Québec", which comes from the Algonquin word kébec meaning "where the river narrows" referred to the area around Quebec City where the Saint Lawrence River narrows to a cliff-lined gap. Early variations in the spelling of the name included Kébec. French explorer Samuel de Champlain chose the name Québec in 1608 for the colonial outpost he would use as the administrative seat for the French colony of New France; the province is sometimes referred to as "La belle province". The Province of Quebec was founded in the Royal Proclamation of 1763 after the Treaty of Paris formally transferred the French colony of Canada to Britain after the Seven Years' War; the proclamation restricted the province to an area along the banks of the Saint Lawrence River. The Quebec Act of 1774 expanded the territory of the province to include the Great Lakes and the Ohio River Valley and south of Rupert's Land, more or less restoring the borders existing under French rule before the Conquest of 1760.
The Treaty of Paris ceded territories south of the Great Lakes to the United States. After the Constitutional Act of 1791, the territory was divided between Lower Canada and Upper Canada, with each being granted an elected legislative assembly. In 1840, these become Canada East and Canada West after the British Parliament unified Upper and Lower Canada into the Province of Canada; this territory was redivided into the Provinces of Quebec and Ontario at Confederation in 1867. Each became one of the first four provinces. In 1870, Canada purchased Rupert's Land from the Hudson's Bay Company and over the next few decades the Parliament of Canada transferred to Quebec portions of this territory that would more than triple the size of the province. In 1898, the Canadian Parliament passed the first Quebec Boundary Extension Act that expanded the provincial boundaries northward to include the lands of the local aboriginal peoples; this was followed by the addition of the District of Ungava through the Quebec Boundaries Extension Act of 1912 that added the northernmost lands of the Inuit to create the modern Province of Quebec.
In 1927, the border between Quebec and Newfoundland and Labrador was established by the British Judicial Committee of the Privy Council. Quebec disputes this boundary. Located in the eastern part of Canada, part of Central Canada, Quebec occupies a territory nearly three times the size of France or Texas, most of, sparsely populated, its topography is different from one region to another due to the varying composition of the ground, the climate, the proximity to water. The Saint Lawrence Lowland and the Appalachians are the two main topographic regions in southern Quebec, while the Canadian Shield occupies most of central and northern Quebec. Quebec has one of the world's largest reserves of fresh water, occupying 12% of its surface, it has 3 % of the world's renewable fresh water. Mor
New York City
The City of New York called either New York City or New York, is the most populous city in the United States. With an estimated 2017 population of 8,622,698 distributed over a land area of about 302.6 square miles, New York is the most densely populated major city in the United States. Located at the southern tip of the state of New York, the city is the center of the New York metropolitan area, the largest metropolitan area in the world by urban landmass and one of the world's most populous megacities, with an estimated 20,320,876 people in its 2017 Metropolitan Statistical Area and 23,876,155 residents in its Combined Statistical Area. A global power city, New York City has been described as the cultural and media capital of the world, exerts a significant impact upon commerce, research, education, tourism, art and sports; the city's fast pace has inspired the term New York minute. Home to the headquarters of the United Nations, New York is an important center for international diplomacy.
Situated on one of the world's largest natural harbors, New York City consists of five boroughs, each of, a separate county of the State of New York. The five boroughs – Brooklyn, Manhattan, The Bronx, Staten Island – were consolidated into a single city in 1898; the city and its metropolitan area constitute the premier gateway for legal immigration to the United States. As many as 800 languages are spoken in New York, making it the most linguistically diverse city in the world. New York City is home to more than 3.2 million residents born outside the United States, the largest foreign-born population of any city in the world. In 2017, the New York metropolitan area produced a gross metropolitan product of US$1.73 trillion. If greater New York City were a sovereign state, it would have the 12th highest GDP in the world. New York is home to the highest number of billionaires of any city in the world. New York City traces its origins to a trading post founded by colonists from the Dutch Republic in 1624 on Lower Manhattan.
The city and its surroundings came under English control in 1664 and were renamed New York after King Charles II of England granted the lands to his brother, the Duke of York. New York served as the capital of the United States from 1785 until 1790, it has been the country's largest city since 1790. The Statue of Liberty greeted millions of immigrants as they came to the U. S. by ship in the late 19th and early 20th centuries and is an international symbol of the U. S. and its ideals of liberty and peace. In the 21st century, New York has emerged as a global node of creativity and entrepreneurship, social tolerance, environmental sustainability, as a symbol of freedom and cultural diversity. Many districts and landmarks in New York City are well known, with the city having three of the world's ten most visited tourist attractions in 2013 and receiving a record 62.8 million tourists in 2017. Several sources have ranked New York the most photographed city in the world. Times Square, iconic as the world's "heart" and its "Crossroads", is the brightly illuminated hub of the Broadway Theater District, one of the world's busiest pedestrian intersections, a major center of the world's entertainment industry.
The names of many of the city's landmarks and parks are known around the world. Manhattan's real estate market is among the most expensive in the world. New York is home to the largest ethnic Chinese population outside of Asia, with multiple signature Chinatowns developing across the city. Providing continuous 24/7 service, the New York City Subway is the largest single-operator rapid transit system worldwide, with 472 rail stations. Over 120 colleges and universities are located in New York City, including Columbia University, New York University, Rockefeller University, which have been ranked among the top universities in the world. Anchored by Wall Street in the Financial District of Lower Manhattan, New York has been called both the most economically powerful city and the leading financial center of the world, the city is home to the world's two largest stock exchanges by total market capitalization, the New York Stock Exchange and NASDAQ. In 1664, the city was named in honor of the Duke of York.
James's older brother, King Charles II, had appointed the Duke proprietor of the former territory of New Netherland, including the city of New Amsterdam, which England had seized from the Dutch. During the Wisconsinan glaciation, 75,000 to 11,000 years ago, the New York City region was situated at the edge of a large ice sheet over 1,000 feet in depth; the erosive forward movement of the ice contributed to the separation of what is now Long Island and Staten Island. That action left bedrock at a shallow depth, providing a solid foundation for most of Manhattan's skyscrapers. In the precolonial era, the area of present-day New York City was inhabited by Algonquian Native Americans, including the Lenape, whose homeland, known as Lenapehoking, included Staten Island; the first documented visit into New York Harbor by a European was in 1524 by Giovanni da Verrazzano, a Florentine explorer in the service of the French crown. He named it Nouvelle Angoulême. A Spanish expedition led by captain Estêvão Gomes, a Portuguese sailing for Emperor Charles V, arrived in New York Harbor in January 1525 and charted the mouth of the Hudson River, which he named Río de San Antonio.
The Padrón Rea
Montreal
Montreal is the most populous municipality in the Canadian province of Quebec and the second-most populous municipality in Canada. Called Ville-Marie, or "City of Mary", it is named after Mount Royal, the triple-peaked hill in the heart of the city; the city is centred on the Island of Montreal, which took its name from the same source as the city, a few much smaller peripheral islands, the largest of, Île Bizard. It has a distinct four-season continental climate with cold, snowy winters. In 2016, the city had a population of 1,704,694, with a population of 1,942,044 in the urban agglomeration, including all of the other municipalities on the Island of Montreal; the broader metropolitan area had a population of 4,098,927. French is the city's official language and is the language spoken at home by 49.8% of the population of the city, followed by English at 22.8% and 18.3% other languages. In the larger Montreal Census Metropolitan Area, 65.8% of the population speaks French at home, compared to 15.3% who speak English.
The agglomeration Montreal is one of the most bilingual cities in Quebec and Canada, with over 59% of the population able to speak both English and French. Montreal is the second-largest French-speaking city in the world, after Paris, it is situated 258 kilometres south-west of Quebec City. The commercial capital of Canada, Montreal was surpassed in population and in economic strength by Toronto in the 1970s, it remains an important centre of commerce, transport, pharmaceuticals, design, art, tourism, fashion, gaming and world affairs. Montreal has the second-highest number of consulates in North America, serves as the location of the headquarters of the International Civil Aviation Organization, was named a UNESCO City of Design in 2006. In 2017, Montreal was ranked the 12th most liveable city in the world by the Economist Intelligence Unit in its annual Global Liveability Ranking, the best city in the world to be a university student in the QS World University Rankings. Montreal has hosted multiple international conferences and events, including the 1967 International and Universal Exposition and the 1976 Summer Olympics.
It is the only Canadian city to have held the Summer Olympics. In 2018, Montreal was ranked as an Alpha− world city; as of 2016 the city hosts the Canadian Grand Prix of Formula One, the Montreal International Jazz Festival and the Just for Laughs festival. In the Mohawk language, the island is called Tiohtià:ke Tsi, it is a name referring to the Lachine Rapids to the island's Ka-wé-no-te. It means "a place where nations and rivers unite and divide". In the Ojibwe language, the land is called Mooniyaang which means "the first stopping place" and is part of the seven fires prophecy; the city was first named Ville Marie by European settlers from La Flèche, or "City of Mary", named for the Virgin Mary. Its current name comes from the triple-peaked hill in the heart of the city. According to one theory, the name derives from mont Réal,. A possibility by the Government of Canada on its web site concerning Canadian place names, is that the name was adopted as it is written nowadays because an early map of 1556 used the Italian name of the mountain, Monte Real.
Archaeological evidence demonstrates that First Nations native people occupied the island of Montreal as early as 4,000 years ago. By the year AD 1000, they had started to cultivate maize. Within a few hundred years, they had built fortified villages; the Saint Lawrence Iroquoians, an ethnically and culturally distinct group from the Iroquois nations of the Haudenosaunee based in present-day New York, established the village of Hochelaga at the foot of Mount Royal two centuries before the French arrived. Archeologists have found evidence of their habitation there and at other locations in the valley since at least the 14th century; the French explorer Jacques Cartier visited Hochelaga on October 2, 1535, estimated the population of the native people at Hochelaga to be "over a thousand people". Evidence of earlier occupation of the island, such as those uncovered in 1642 during the construction of Fort Ville-Marie, have been removed. Seventy years the French explorer Samuel de Champlain reported that the St Lawrence Iroquoians and their settlements had disappeared altogether from the St Lawrence valley.
This is believed to be due to epidemics of European diseases, or intertribal wars. In 1611 Champlain established a fur trading post on the Island of Montreal, on a site named La Place Royale. At the confluence of Petite Riviere and St. Lawrence River, it is where present-day Pointe-à-Callière stands. On his 1616 map, Samuel de Champlain named the island Lille de Villemenon, in honour of the sieur de Villemenon, a French dignitary, seeking the viceroyship of New France. In 1639 Jérôme Le Royer de La Dauversière obtained the Seigneurial title to the Island of Montreal in the name of the Notre Dame Society of Montreal to establish a Roman Catholic mission to evangelize natives. Dauversiere hired Paul Chomedey de Maisonneuve 30, to lead a group of colonists to build a mission on his new seigneury; the colonists left France in 1641 for Quebec, arrived on the island the following year. On May 17, 1642, Ville-Marie was founded on the southern shore of Montreal is
Road surface
A road surface or pavement is the durable surface material laid down on an area intended to sustain vehicular or foot traffic, such as a road or walkway. In the past, gravel road surfaces and granite setts were extensively used, but these surfaces have been replaced by asphalt or concrete laid on a compacted base course. Road surfaces are marked to guide traffic. Today, permeable paving methods are beginning to be used for low-impact walkways. Pavements are crucial to countries such as US and Canada, which depend on road transportation. Therefore, research projects such as Long-Term Pavement Performance are launched to optimize the life-cycle of different road surfaces. Asphalt, sometimes called flexible pavement due to the nature in which it distributes loads, has been used since the 1920s; the viscous nature of the bitumen binder allows asphalt concrete to sustain significant plastic deformation, although fatigue from repeated loading over time is the most common failure mechanism. Most asphalt surfaces are laid on a gravel base, at least as thick as the asphalt layer, although some'full depth' asphalt surfaces are laid directly on the native subgrade.
In areas with soft or expansive subgrades such as clay or peat, thick gravel bases or stabilization of the subgrade with Portland cement or lime may be required. Polypropylene and polyester geosynthetics have been used for this purpose and in some northern countries, a layer of polystyrene boards have been used to delay and minimize frost penetration into the subgrade. Depending on the temperature at which it is applied, asphalt is categorized as hot mix, warm mix, or cold mix. Hot mix asphalt is applied at temperatures over 300 °F with a free floating screed. Warm mix asphalt is applied at temperatures of 200–250 °F, resulting in reduced energy usage and emissions of volatile organic compounds. Cold mix asphalt is used on lower-volume rural roads, where hot mix asphalt would cool too much on the long trip from the asphalt plant to the construction site. An asphalt concrete surface will be constructed for high-volume primary highways having an average annual daily traffic load greater than 1200 vehicles per day.
Advantages of asphalt roadways include low noise low cost compared with other paving methods, perceived ease of repair. Disadvantages include less durability than other paving methods, less tensile strength than concrete, the tendency to become slick and soft in hot weather and a certain amount of hydrocarbon pollution to soil and groundwater or waterways. In the mid-1960s, rubberized asphalt was used for the first time, mixing crumb rubber from used tires with asphalt. While a potential use for tires that would otherwise fill landfills and present a fire hazard, rubberized asphalt has shown greater incidence of wear in freeze-thaw cycles in temperate zones due to non-homogeneous expansion and contraction with non-rubber components; the application of rubberized asphalt is more temperature-sensitive, in many locations can only be applied at certain times of the year. Study results of the long-term acoustic benefits of rubberized asphalt are inconclusive. Initial application of rubberized asphalt may provide 3–5 decibels reduction in tire-pavement source noise emissions.
Compared to traditional passive attenuating measures, rubberized asphalt provides shorter-lasting and lesser acoustic benefits at much greater expense. Concrete surfaces are created using a concrete mix of Portland cement, coarse aggregate and water. In all modern mixes there will be various admixtures added to increase workability, reduce the required amount of water, mitigate harmful chemical reactions and for other beneficial purposes. In many cases there will be Portland cement substitutes added, such as fly ash; this can improve its physical properties. The material is applied in a freshly mixed slurry, worked mechanically to compact the interior and force some of the cement slurry to the surface to produce a smoother, denser surface free from honeycombing; the water allows the mix to combine molecularly in a chemical reaction called hydration. Concrete surfaces have been refined into three common types: jointed plain, jointed reinforced and continuously reinforced; the one item that distinguishes each type is the jointing system used to control crack development.
One of the major advantages of concrete pavements is they are stronger and more durable than asphalt roadways. They can be grooved to provide a durable skid-resistant surface. A notable disadvantage is that they can have a higher initial cost, can be more time-consuming to construct; this cost can be offset through the long life cycle of the pavement. Concrete pavement can be maintained over time utilizing a series of methods known as concrete pavement restoration which include diamond grinding, dowel bar retrofits and crack sealing, cross-stitching, etc. Diamond grinding is useful in reducing noise and restoring skid resistance in older concrete pavement; the first street in the United States to be paved with concrete was Court Avenue in Bellefontaine, Ohio in 1893. The first mile of concrete pavement in the United States was on Woodward Avenue in Detroit, Michigan in 1909. Following these pioneering uses, the Lincoln Highway Association, established in October 1913 to oversee the creation of one of the United States' earliest east-west transcontinental
