Warning Signs: Curves, Intersections, Road Conditions, and Pedestrian/School Warnings
What warning signs do
Warning signs alert you to a change or hazard ahead. Most are yellow diamonds with black symbols, but pedestrian and school warnings often use fluorescent yellow-green. They do not by themselves set a legal speed or forbid a movement; they tell you to adjust speed, lane position, and attention before you reach the condition.
Core rules
- Warning signs are placed in advance of the hazard. The distance may be shown on a plaque, and the condition may continue for a stated distance.
- A curve sign with an advisory speed plaque, such as 35 MPH, recommends a safe speed for the curve. It is not an absolute legal maximum like a white speed-limit sign, but exceeding it can still be too fast for conditions.
- Intersection warning signs show the layout ahead: side road, T-intersection, crossroad, or a junction with a warning plaque.
- Pedestrian and school signs require extra scanning for children, crossing guards, and stopped school buses. School area signs may be pentagon-shaped when they mark a school crossing.
- Road-condition signs warn of slippery pavement, narrowing lanes, divided highway begins or ends, and similar hazards.
Worked example
You see a yellow diamond showing a right curve and a 35 MPH plaque, while the white speed-limit sign still says 55. Reasoning: the white sign is the legal maximum; the yellow sign warns that 35 is the recommended maximum for the curve. In rain or snow, you should go slower than 35 because the advisory assumes good conditions. Do not brake sharply inside the curve; reduce speed before it.
Traps
Treating an advisory speed as a legal speed limit and ignoring it completely are both errors. Missing a distance plaque such as NEXT 2 MILES. Assuming a warning sign means the hazard is at the sign rather than ahead. Failing to slow for a school warning because no children are visible yet.