2 METHOD FOR SECONDARY ACCIDENT PREVENTION BASED ON MAGNETIC INDUCTION PRINCIPLE GUARD RAIL
2 Sign system responsive distance and speed detecting for preventing second traffic accident
2 Warning System for Preventing Secondary Collision on Expressway
2 Warning System for Preventing Secondary Collision on Expressway
2 Warning System for Preventing Secondary Collision on Expressway
2 Warning System for Preventing Secondary Collision on Expressway
3 4 INTEGRATED DIAGONAL CROSSWALK FOR THREE-WAY AND FOUR-WAY CROSSROAD
ABNORMALITY DETECTION METHOD, ABNORMALITY DETECTION APPARATUS, AND ABNORMALITY DETECTION SYSTEM