US Patent 8344877 Track worker safety system

A safety system for providing early warning notifications to an authorized track worker performing official duties along a rail road network is disclosed herein. The safety system determines the position of the authorized worker and determines an estimated time to collision between the authorized track worker and an approaching rail vehicle. The result of the safety system is that the track worker has enough time and sufficiently accurate warning that will enable the track worker to move to a point of safety so as to remain unharmed by the approaching rail vehicle.