Rollbar

roll bar

noun
a heavy steel transverse bar in the form of an inverted U rising from the framework of an automobile to prevent its occupants from being crushed if the vehicle rolls over.
Also, rollbar.


Origin:
1950–55

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World English Dictionary
rollbar (ˈrəʊlˌbɑː)
 
n
a bar that reinforces the frame of a car, esp one used for racing, rallying, etc, to protect the driver if the car should turn over

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