Warning Signs
Warning signs alert you to a change in road conditions ahead so you can adjust speed and position before you reach it. The exam tests shape and color recognition, the meaning of advisory plaques, and the difference between a warning and a legal requirement.
Core rules
- Most warning signs are yellow diamonds with black symbols. Fluorescent yellow-green is reserved for pedestrian, bicycle, and school warnings. Orange is for construction.
- Warning signs are placed in advance of the condition. The distance grows with the posted speed: roughly 100–200 ft in urban areas and 300–500 ft or more on rural high-speed roads.
- Curve signs show a left or right arrow. A yellow advisory speed plaque (for example, 35 MPH) is the maximum recommended speed in good conditions, not a posted legal limit.
- Chevron signs (a series of yellow arrows on a rectangle) mark the outside of a sharp curve and guide alignment; they are not route markers.
- Object markers (Type 1, 2, or 3) flag obstacles near the roadway; pass on the side the marker indicates.
- Merge, lane-ends, crossroad, side-road, slippery-when-wet, and hill signs each describe a specific hazard, not a general caution.
Worked example
You see a yellow diamond with a right-curve arrow and a "35 MPH" plaque, while the speed limit sign says 55. The legal limit remains 55, but 35 is the advisory speed for the curve. If you enter at 55 and crash, the advisory plaque and the basic speed rule can support a citation for driving too fast for conditions. Slow before the curve, not in it.
Traps
- Reading the advisory speed as a speed limit.
- Confusing a curve sign (advance warning) with a chevron (alignment guide inside the curve).
- Treating standard yellow and fluorescent yellow-green as the same.
- Assuming a warning sign is enforceable by itself.