Definition of "rollbar"

For instance, the suspension structure consists of the total suspension force, the damper force, spring force, jounce bumper force, rollbar force and linear damping force for each corner of the vehicle.

1999, KM Connair, MO Bodie, P Chaumette, A Catalan, Development of a common vehicle model for chassis control design, sae.org

A car that feels limp and soggy usually has a suspension defect that requires attention. Most problems stem from issues associated with the numerous bushes fitted to suspension arms and rollbar assemblies.

2013, Robert Foskett, Alfa Romeo 916 GTV and Spider: The Complete Story‎

Such a system also allows the additional incorporation of rollbars and a steering system to investigate the cross coupling of left and right suspension systems through rollbar compliance

2014, Michael Blundell, Damian Harty, The Multibody Systems Approach to Vehicle Dynamics‎, page 216

Thanks to the remarkably springy rollbar suspension system of the Citroen 2CV, when Flash did hit the ground, it merely bounced up again.

2016, Darren Bane, The Furgle and the Frimp‎

The Sir Vival also had a raised driver’s cabin with seat belts, a padded interior and built-in rollbars.

2007 September 23, Jerry Garrett, “Making the World Safe for Velocity”, in New York Times‎