Chapter 12: Warning Signs
Yellow Means Hazard Ahead
Warning signs use a yellow background specifically so your eye catches them before you consciously process the symbol — yellow is one of the most visually alerting colors against most road backgrounds. Common warning signs include sharp curve ahead, steep grade, pedestrian or bicycle crossing, deer crossing in rural areas, and school zones.
Reacting to Warning Signs
Unlike regulatory signs, warning signs do not usually carry a specific legal penalty on their own — but ignoring what they tell you is exactly how avoidable crashes happen. A curve-ahead sign is your cue to slow down before the curve, not during it, since braking mid-curve shifts weight in a way that can break traction.
Speed Limit Signs
Numeric speed limit signs are technically regulatory (white background) but are grouped here because they work hand-in-hand with warning signs — a curve-ahead warning is often paired with an advisory speed a few miles per hour below the posted limit, specifically for that stretch of road.