Square
A square is an open space, where a public road opens or several public roads come together, and where the location allows traffic and other acti…
road
Speed
The speed depends on the type of road and the conditions in which you are driving. Do not drive faster than the speed limit and make sure you ca…
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
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
A siren is a sound signal that priority vehicles use to warn other road users that they have to pass.
