Road debris
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Road debris, a form of road hazard, is debris on or off a road. Road debris includes substances, materials, and objects that are foreign to the normal roadway environment. Debris may be produced by vehicular or non-vehicular sources, but in all cases it is considered litter, a form of solid waste. Debris may tend to collect in areas where vehicles do not drive, such as on the edges (shoulder), around traffic islands, and junctions.
Debris in Galway, Ireland accumulating on a cycle lane
Waste in Amol - Behind of Haraz Road (Road 77) (Iran)
Garbage and waste dumped by a road in Talisay, Cebu. Extreme form of roadside litter containing all sorts of waste materials: plastic, metal, glass, paper, cardboard and biowaste
In 1914 St. Louis, Missouri, litter was removed from streets by water wagons, as shown in this drawing by Marguerite Martyn of the St. Louis Post-Dispatch
Litter
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Litter consists of waste products that have been discarded incorrectly, without consent, at an unsuitable location. The word litter can also be used as a verb: to litter means to drop and leave objects, often man-made, such as aluminum cans, paper cups, food wrappers, cardboard boxes or plastic bottles on the ground, and leave them there indefinitely or for other people to dispose of as opposed to disposing of them correctly.
Platform of Strathfield station in Sydney, Australia. Rubbish accumulated over months, perhaps years due to unsustained periods of frequent cleaning.
Rubbish on a street corner in Germantown, Maryland, left behind by panhandlers.
A small river's valley in India shows extensive littering of plastic and paper. Human waste, illustrated by the urinating man, increase fecal coliform and other bacteria levels in the water.
Littering in nature