In order to guarantee personnel safety in accidents of "sports car" of the trackless rubber wheel, new automatic flexible blocking system was researched, which combined with stopper, speed monitoring system, vehicle-mounted remote control and control system. In operating of this system, driving condition of vehicles could be monitored automatically by speed measurement radar and car remote control. From the test run practice, we could know that when the sports car accident occurred, the stop time was about 3.5 s, and the stop distance was about 12 m, which showed good effect.