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Related to roll bar: Anti roll bar
A sturdy metal bar over the top of a car or other wheeled vehicle to prevent or reduce injury in case of a rollover.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
a steel bar arching over an automobile from side to side, designed to protect the passengers if the vehicle rolls over.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Protective metal bar that arches over the driver in an open cockpit.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited