roll bar

• rollbar, roll-bar

roll bar (plural roll bars)

1. A strong U-shaped bar fastened to the frame of a vehicle, such as an off-road vehicle or a race car to protect the driver and passengers from being crushed in the event that the vehicle rolls over.
   • 2002, Bobby Alvarez, Ghost Runner on Second‎^[1], page 163:

     Once the two left wheels departed the surface, Travis knew he was in for trouble. Since there wasn't a roll bar on the SUV, the roof was probably going to collapse on his head when it contacted the asphalt.

2. An anti-roll bar.
   • 2004, Jonathan Noble, Mark Hughes, Formula One Racing For Dummies‎^[2], page 65:

     The roll bar is a metal bar linking one side of the suspension to the other. It limits how much the car rolls during cornering.

• roll cage