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Road

Slope

Slope

A slope or grade of a road refers to the tangent of the angle of the road to the horizontal. It is a special case of the slope, where zero indic…

Slippery road

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…

Siren

Siren

A siren is a sound signal that priority vehicles use to warn other road users that they have to pass.

Runaway truck ramp

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…

Roadrage

Roadrage

Roadrage is aggressive or angry behavior exhibited by motorists. These behaviors include rude and offensive gestures, verbal insults, physical t…

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