The photo below, is said to represent the front view glass (now broken & spidered after receiving the head of the operator) of a container gantry crane situated at Pier J - Long Beach, CA. The operator chose to not wear his/her lap and shoulder harness belts and got caught short in a high speed, abrupt stop.
We're told the operator ended up with a black eye and some bruised ribs. The results could have been substantially worse, and we can only hope that he/she (and others paying attention) will regard this event as an object lesson.
The OSHA regulation (circa 1983, and in need of some updating):
A seat (lap) belt, meeting the requirements of 49 CFR 571.208-210 for a Type 1 seat belt assembly, shall be installed on the operator's seat of high speed container gantry cranes where the seat trolleys.