A worker was providing instructions to two skid steer operators regarding the removal of frozen cattle feces from two cattle lanes. The skid steer operators where side by side, preparing to start the removal process when skid steer operator A honked his horn to get the attention of operator B. At this time, the worker was walking away from the operators and returning to his truck. The worker thought the horn was to gain his attention so he turned and walked up to skid steer operator A. Skid steer operator A did not realize the worker had approached his skid steer and the skid steer began moving in the forward direction. The worker's left leg was struck and run over by the rear wheel of skid steer A resulting in a fracture to the tibia and fibula. The injury required surgery and in-patient hospitalization.