|Entry awareness by photo-electric beam
|One-man depot operators are often unaware that a truck mixer (or visitor) has entered the depot if, at the
time, the operator is in a loading shovel, filling storage bins, out of sight, and without the benefit of being able to hear the arrival.
Tarmac Northern's Concrete & Mortar, Yorkshire, have therefore set up a photoelectric beam on one gate post and a reflector on the other. When the beam is interrupted, a time switch is activated which operates a flashing beacon for a preset period. The beacon is placed within vision of the storage bins area, thus alerting the depot operator.