A roll cage is a specially constructed tubular frame built in or around the cab of a vehicle to protect its occupants from injury in the case of an accident or rollover.
Building a roll cage 101.
This is the typical 6 or 5 without the passenger door bar nhra style roll bar.
Shown here is a visual difference between your basic 4 point roll cage and an 8 point roll cage from the chris alston s chassisworks catalog.
Adding diagonal main hoop support braces turns it into and 8 point roll bar.
The basic 4 point roll bar consists of a main hoop behind the driver two rear struts and an optional cross brace on the main hoop should you need it or the rules.
The bars shown in blue are optional.
A standard feature in race.