Warning signs
Truck Rollover Warning sign
A ramp or curve ahead has a history of trucks and other high center of gravity vehicles tipping over at speed. Trucks in particular should slow well below the posted ramp speed.
- Diamond
- Yellow
- MUTCD W1-13
Shape and background first
Federal designation W1-13 in the MUTCD, the national standard every state signs to. Placed on highway interchange ramps and loop ramps where the curve radius is tight enough that loaded trucks have rolled over there before.
What the MUTCD specifies
Designation: W1-13
MUTCD Section 2C.11
Conventional road size: 36 x 36 in
Source: Federal Highway Administration, MUTCD 11th Edition (December 2023), Part 2, Table 2C-1, verified 2026-09-26.
What the test wants you to know
The mistake people make
This sign exists because standard curve advisory speeds are calculated for passenger cars, and a loaded truck's higher center of gravity can roll it before it would ever skid. The expected answer on a commercial license question is to brake before the curve, not during it, since braking mid curve on a tall vehicle can itself trigger a rollover.
