Runaway truck ramp
A runaway truck ramp is a traffic device that enables vehicles which are having braking problems to safely stop. It is typically a long, sand- o…
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Roundabout
A roundabout is a kind of circular intersection in which the traffic continuously drives in one direction around a central island. The drivers a…
Roof rack
A roof rack is a set of bars secured to the roof of a car. It is used to carry bulky items such as luggage, bicycles, canoes, kayaks, skis, or v…
Rockfall
Rockfall refers to quantities of rock falling freely from a cliff face. A rockfall is a fragment of rock detached by sliding or falling, that fa…
Roadmarks
Roadmarks are used on paved roadways to provide guidance and information to drivers and pedestrians. Uniformity of the markings is an important …
