Products / Loading dock equipment / Trailer restraints / Vehicle restraints / Manually operated vehicle restraints Mechanical restraints Mechanical restraints are manually activated and offer lower day-to-day operating costs, higher up-time performance and operational simplicity. Some units can be combined with a light communication package for clear communication STAR2 manually operated restraintManually operated restraint with sensor bar SL40 series mechanical vehicle restraintManually operated restraint with dual locking positions