Orange (FOSOW & Hi-TECH) Tower Crane Anti-Collission System (ACD) & Safe Load Indicator (SLI) can be used for various luffing, level-jib,fixed type and travel type tower cranes. This system protects the jib and hook of the tower crane. When encountering obstacles, the system can intelligently control the stopping distance according to tower crane operation speed, wind speed and etc. It applies to any tower head, flat arm and swing arm tower crane. The system is designed specially to solve the problem that tower crane needs to change security monitoring device in different environments constantly, only by adding functions of two sets of equipment can be achieved, to save 50% cost of ownership