Advisory Speed Sign
The advisory speed sign is a small square yellow sign with a black number and the word "MPH" below it. It's posted below warning signs — most commonly curve, turn, and exit ramp signs — to recommend a safe speed for that specific road feature. Advisory speed signs are not the same as speed limit signs. A speed limit (white rectangular sign) is a legally enforceable maximum. An advisory speed (yellow square sign) is a recommendation for the curve, ramp, or other feature under ideal conditions. While you won't get a ticket specifically for exceeding an advisory speed, if you crash because you went too fast through a curve that had an advisory speed posted, you can be cited for driving at an unsafe speed. Advisory speeds are calculated for passenger cars in good weather with normal tires. In poor weather conditions — rain, ice, fog — you should drive below the advisory speed. For heavier vehicles or those with trailers, the safe speed through a curve is typically lower than the posted advisory. Advisory speeds are especially common on highway exit ramps, where drivers transitioning from high-speed highway travel to lower-speed surface streets may be traveling faster than they realize.
Rules & What to Do
Reduce speed to at or below the advisory speed before reaching the curve, ramp, or other feature. In rain, ice, or poor conditions, drive slower than the advisory speed. Pay special attention to advisory speeds on exit ramps — decelerate before the curve.
Penalties
Advisory speeds are not legally enforceable like speed limits. However, exceeding the advisory speed and losing control can result in citations for driving at an unsafe speed or reckless driving, with fines of $100-$400 depending on circumstances.
For Commercial Drivers
Advisory speeds are set for passenger vehicles, not commercial trucks. CDL drivers should reduce speed 5-10 mph below the advisory speed on curves and ramps, especially when loaded. A loaded truck's higher center of gravity makes it far more susceptible to rollover on curves. Tanker trucks with liquid loads should go even slower due to liquid surge. Never take an exit ramp faster than the advisory speed in a commercial vehicle.
Frequently Asked Questions
What does the yellow speed sign mean?
A yellow speed sign is an advisory speed — it recommends a safe speed for a curve, ramp, or other road feature. It's a recommendation, not a legal limit, but you should follow it for safety.
Is an advisory speed sign the same as a speed limit?
No. A speed limit sign is white and rectangular and is legally enforceable. An advisory speed sign is yellow and square and is a recommended speed. However, driving unsafely above an advisory speed can still result in a citation.
What does the yellow speed limit sign under a curve sign mean?
The yellow speed plate below a curve sign recommends a safe speed for navigating that specific curve. Slow down to that speed or below before entering the curve, and go even slower in bad weather.