Slippery road
Road slipperiness is a condition of low skid resistance due to insufficient road friction. It is a result of snow, ice, water, loose material an…
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Siren
A siren is a sound signal that priority vehicles use to warn other road users that they have to pass.
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…
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…
