In handi-capped racing you race the clocks. You dial in a time your car can compete at and then you rely upon on board computers and compressed air controls to stay within your desired bracket. This keeps your costs in line with the axiom of How fast can you afford to go? If you are actually driving by the seat of your pants and guess wrong, you could go faster than you would want to run (your dial in) and be eliminated by the 5% rule (you can not run under 5% of your dialed time; ever).
Or you can race like I do and run heads up. That means you both leave when the light turns green and the one who gets to the other end of the track first turns on the win light (usually these kind of races are prearranged and times are not posted up on the display board). There is no break out to worry about, and so long as you do not break any NHRA safety rules (such as running too fast for the amount of safety equiupment in the car) you can race all night long. Go to fast and not have a helmet (or a full roll cage, or a parachute and on board fire extinguisher, and other things not normally found on a true street car) and they ask you to leave, and not come back for a while.