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when stop? / when stop?

when stop?
when stop?

This product is designed to calculate the fastest time and distance the car needs from the motion into the stationary state according to the speed of the vehicle in order to warn the drivers and passers-by to prevent accidents from happening. With the equivalent substitution of speed and distance, drivers are warned not to drive fast. Cherish life, and keep away from the express!

University

Central South University

Central South University
Changsha,Hunan, China

hao chang,
Central South University

nannan qiu,
Central South University

ziqi wei,
Central South University