I see gross generalizations stating do not under any circumstances install a roll cage in a street car because you might bang your head. How 'bout: Do not build a car capable of 150mph that does NOT have a roll cage--especially if it is capable of significant front end lift. Now there's a statement!! "Don't do it!!" is of no help at all. Instead there should be a thorough discussion about cage design that covers various topics including
-Bar Placement: By juggling seat height and side halo bar placement it is entirely possible to build 5" clearance between head and halo.
-Seat Type: I have a one piece FIA seat with significant side bolstering.
-Seat Mounting and Location. My one piece seat is rigid mounted to the cage and does not hinge.
-Padding Type
http://lockracewrks.com/Products/Saf...BSCI/bsci.html available from BSR.
-Belt Type Mounting: Requires it's own discussion
Properly planned and executed, a roll cage will not hurt you and may very well save your ass--even on the street. I say do it--but do it right.
Oh! And keep your helmet in the car. You never know when it might come in handy
