International E-road network
The international E-road network is a numbering system for roads in Europe developed by the United Nations Economic Commission for Europe (UNECE). The network is numbered from E1 up and its roads cross national borders. It also reaches Central Asian countries like Kyrgyzstan, since they are members of the UNECE.
E3 in Denmark, before 1992: Changed to E45; the number E3 was re-attributed.
Intersection of E42 and E451 near Frankfurt Airport
The European route E90 near Torregrotta, Italy
The E201 in the Republic of Ireland
Controlled-access highway
A controlled-access highway is a type of highway that has been designed for high-speed vehicular traffic, with all traffic flow—ingress and egress—regulated. Common English terms are freeway, motorway, and expressway. Other similar terms include throughway or thruway and parkway. Some of these may be limited-access highways, although this term can also refer to a class of highways with somewhat less isolation from other traffic.
The cloverleaf interchange between US 131, M-6 and 68th Street in Cutlerville, Michigan, United States, shows many of the features of controlled-access highways: entry and exit ramps, median strips for opposing traffic, no at-grade intersections and no direct access to properties.
Typical overhead signage on Ontario's King's Highway network featuring an airport pictogram, distances to upcoming interchanges, and lane guidance
An aerial view of Finnish national road 3 (E12), a motorway between Tampere and Helsinki in Finland
Autostrada A1 (E35/E45) runs through Italy linking some of the largest cities of the country: Milan, Bologna, Florence, Rome and Naples