Warning Signs

Warning signs indicate in advance conditions on or adjacent to a road that will normally require caution and may require a reduction in vehicle speed. Adequate warning signs offer a higher level of safety and a more efficient traffic flow for drivers.

However, the overuse of warning signs may promote disrespect for traffic control devices, and the use of such signs should be kept to a minimum. Improved highway design will generally have the effect of reducing the need for warning signs.

Warning signs are classified into the following groups according to their particular function:

WA: Physical conditions signs indicate features or conditions of the road itself
WB: Traffic regulations ahead signs provide an advance warning of a traffic regulation on a road.
WC: Intermittent or moving hazards signs indicate the possibility of a situation that may require a driver response.