Add a soft foam bumper at the end of the track to stop fast cars that still have some momentum when they reach the end of the friction brake.
(fast cars; have; some momentum; T:when they reach the end of the friction brake; T:still) (they; reach; the end of the friction brake)
fast cars they
have reach
some momentum T:when they reach the end of the friction brake T:still
the end of the friction brake