Truck Rollover Warning Sign
Curve ahead is dangerous for trucks at high speed
What to do
Trucks must slow to advisory speed. Cars also use caution.
Tips
Especially important for high-profile vehicles and trucks.
Test yourself
You see this sign while driving. What do you have to do?
Show the answer
Trucks must slow to advisory speed. Cars also use caution.
Common mistake
Trucks taking curves too fast
About warning signs
Warning signs are diamond-shaped and yellow with black symbols. They alert you to hazards ahead — curves, intersections, crossings — so you have time to slow down. On the DMV written test, expect several questions asking what a specific warning sign means and what action it calls for.
Practice the rule this sign carries
What is 'brake fade' and when does it typically occur?
- A. When brakes gradually wear out over 50,000 miles
- B. Normal variation in braking force at different speeds
- C. A problem only affecting vehicles over 10 years old
- D. Temporary reduction in braking effectiveness caused by overheating during repeated hard braking
Show answer
D. Temporary reduction in braking effectiveness caused by overheating during repeated hard braking — Brake fade occurs when friction material overheats, reducing braking force. Common on long downgrades with repeated braking. Prevention: use engine braking in low gear on descents rather than constant brake application.
Universal rule · checked against NHTSA Vehicle Safety — Brake Fade Explanation · verified 2026-07-28
Besides on steep grades, when else is downshifting to use engine braking a useful everyday driving technique?
- A. Never — engine braking should only ever be used on mountain descents
- B. In reverse gear
- C. Only when the vehicle has a manual transmission and no brakes at all
- D. When slowing gradually for a stop in normal traffic
Show answer
D. When slowing gradually for a stop in normal traffic — Letting engine compression help slow the car during routine deceleration — not just on hills — reduces how hard and how often your brake pads have to work, extending their lifespan.
Universal rule · checked against NHTSA Safe Driving — Vehicle Maintenance — Engine Braking in Everyday Driving · verified 2026-07-28
Frequently asked questions
What does the Truck Rollover Warning Sign mean?
Curve ahead is dangerous for trucks at high speed
What should you do at a Truck Rollover Warning Sign?
Trucks must slow to advisory speed. Cars also use caution.
Reference standard: Federal Highway Administration Manual on Uniform Traffic Control Devices ↗. State and local agencies may add rules or operating times, so follow the complete posted sign where you drive. How DMV Prep sources content.
Studying for a car permit instead? Drill all 111 signs with flashcards.
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