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I wouldn't want a roll cage on a street car. I've been led to believe that a roll cage should only be used in a car where the driver is wearing a helmet,race car style restraints and protective gear. A typical 3 point seat belt allows a person's body to move around in the car to a degree. In an accident, a person's head could slam into the roll cage causing injuries

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What would the difference be if you hit your head on the roof frame or pillar of the car verses a rollbar? Atleast you can pad a rollbar. I think you would fair better hitting a round tube verses a squared edge of a pillar or roof edge.