the speed that these cars achieve, any automated on-board safety system is prone to fail, parachutes will burn up in a split second, extinguish systems might not trigger a release and so on. So it must be something that isn't necessary part of the car or controlled by the driver.
A safer system could be applied as it being used to slow down commercial jets at the end of the runway by making it sink into a non- flammable grain/sand hole.
The key is to slow down the car once it is out of control of the driver, shorten the strip somehow defeats the purpose for this kind of racing.
History has shown that if the sanctioning body tries to slow things down, engineers will figure out a way to comprehend.....see F1 and their antics trying to do this for the last decade.....and fail.
Every good driver has bugs stuck to his door windows - do it sideways ;-)


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