Everybody stand back.....
I have the answer....
Besides discrete frequencies involved, issues are always present with electronic control of anything...let-alone the wireless broadcasting and reception of such...
I suggest we go to a mechanical safety back up....
Hot Wheel-like pits in the shutdown lanes with aircraft carrier arrestor hooks, and of course, drivers capsules like dragboats, that way, the hook grabs the car, the car slows too fast, the capsule spits out of the car like a cherry pit between your fingers....and a second finishline to record the "bonus" finish....which can be rolled into the NHRA countdown points....
Let me know....I'm gonna go patent it....