This product is a guardrail with auto alarm system and caution light. On roads in sparsely populated, low visibility and dangerous places, once a car crashes into the guardrail, the caution light of the Autoalarm Guardrail would switch on to warn the approaching vehicles. It aims to help people in traffic accidents, especially when no one else around. By giving ample warning, a potential second accident can be avoided. Meanwhile, because of the open circuit, the broken guardrail would automatically transmit the signal to the nearest police station and hospital to get help. Moreover, with the inner GPS device, the guardrail would report the specific location and direct the police towards the accident.