Warning Signs: Hazards and Road Conditions Ahead
Warning signs: hazards ahead
Warning signs alert you to a hazard or change in road conditions ahead. They do not usually create a legal duty to stop; they create a duty to adjust speed and attention. In Nigeria they are normally triangular with a red border, white background and black pictogram; a yellow background or supplementary plate often marks a temporary condition such as road works.
What the common symbols mean
- Bend or double bend: reduce speed before the curve, keep left.
- Narrow bridge or road narrows: prepare to give way; do not overtake.
- Slippery road: ease off the accelerator, avoid sudden braking or steering.
- Pedestrian crossing or school children: expect people on the carriageway; be ready to stop.
- Cattle or wild animals: livestock movement is common on rural highways.
- Road works, fallen rocks, uneven road: scan far ahead and increase following distance.
Placement and distance Warning signs are placed in advance of the hazard. On rural roads the distance is longer because speeds are higher; in towns the sign may be close to the hazard. A rectangular plate below the triangle may give a distance (“500 m”) or a direction.
Worked example A triangle shows a car with skid marks behind it. The question asks what you should do. Reasoning: the skid symbol means slippery road, not “slippery when wet only” and not a speed limit. Correct action is to slow down smoothly before the hazard, avoid harsh braking and increase the gap to the vehicle ahead.
Traps that cost marks A warning triangle is not a regulatory sign: it does not by itself set a speed limit or order you to stop. Do not confuse the pedestrian-crossing warning triangle with the blue square pedestrian-crossing information sign. Do not ignore a warning sign because the road looks clear; the hazard may be hidden by a bend or crest.