A roll bar is an essential component of a vehicle's safety system, and there are many synonyms for this term. A roll bar is often referred to as a roll cage, which is an enclosure made of metal tubes that surrounds the driver and provides protection during a rollover event. Other synonyms for a roll bar include a safety cage, a protective frame, or simply a bar. These terms all refer to the same basic structure, which provides added safety to a vehicle's occupants in the event of an accident. Regardless of the term used, a roll bar is an important safety feature for any vehicle that will be driven under challenging conditions or at high speeds.