Abstract: Numerous unstable rock mass with the rock fall potential are inevitably created during the highway construction. The rockfall hazards, which are developed from the unstable rock mass, play a critical role to the safe and effective highway operation. The highway safety monitoring and rock fall hazard warning that can minimizing the loss of life and property are important topics for highway engineering practitioners. The highway related hazards have the characteristics of wide distribution, small scale, small deformation, sudden occurrence and large consequences. As a result, the highway safety monitoring system should have the advantage of low cost, long duration, high precision and high accuracy. In this paper, the systematic safety monitoring system is composed of noncontact surface displacement monitoring method using the laser ranging method. The crack and macroscopic deformation monitoring method and the monitoring of the unstable rock mass using Radio Frequency Identification (RFID) technique are also proposed. The sound and light alarm devices are proposed to inform vehicles regarding the rockfall hazard information in order to minimize the consequence damage.

Key words: Rock Fall Hazards, Rock Fall, Safety Monitoring, Laser Distance Ranging, Radio Frequency Identification (RFID)