A SignalA visual display device which conveys instructions or provides prior warning of instructions regarding the driver’s authority to proceed. More that is displayed to a train driver approaching an ABCLAbbreviated term for Automatic Barrier Crossing Locally Monitored. More or AOCLAbbreviated term for Automatic Open Crossing Locally Monitored. More to
indicate that the Level Crossing protection systemThe operation of Road Traffic Signals and/or Barriers/Gates manually or by an approaching train. More has activated.