Solid state auxiliary controllers

Claim 1

TRAFFIC CONTROL APPARATUS RESPONSIVE TO SIGNAL CONTROL FAILUREA FOR PRODUCING A CAUTIONING CONTROL SIGNAL COMPRISING: A SOURCE OF A CAUTIONING SIGNAL, A SOURCE OF A FIRST SET OF CONTROL SIGNALS DIRECTING TRAFFIC ALONG A FIRST DIRECTION AND A SECOND SET OF CONTROL SIGNALS DIRECTING TRAFFIC ALONG A SECOND DIRECTION THAT INTERSECTS WITH SAID FIRST DIRECTION, AN OUTPUT SEMICONDUCTOR DEVICE COUPLED TO SAID CAUTIONING SIGNAL SOURCE AND CAPABLE OF ASSUMING A FIRST STATE AND A SECOND STATE WHICH SECOND STATE ACTIVATES SAID CAUTIONING SIGNAL SOURCE, FIRST AND SECOND SEMICONDUCTOR TIMING CIRCUITS COUPLED TO SAID SOURCE OF CONTROL SIGNALS AND RESPONSIVE TO NORMAL OPERATION OF SAID FIRST SET OF CONTROL SIGNALS AND SAID SECOND SET OF CONTROL SIGNALS FOR CONTINUOUSLY PROVIDING SAID OUTPUT SEMICONDUCTOR DEVICE WITH A DISABLING SIGNAL THAT NORMALLY MAINTAINS SAID OUTPUT SEMICONDUCTOR DEVICE IN SAID FIRST STATE WHEN BOTH SAID FIRST SET OF CONTROL SIGNALS AND SAID SECOND SET OF CONTROL SIGNALS OCCUR IN NORMAL SEQUENCE, SAID FIRST AND SECOND TIMING CIRCUITS BEING RESPONSIVE TO THE ABNORMAL OCCURRENCE OF SAID FIRST SET OF CONTROL SIGNALS AND SAID SECOND SET OF CONTROL SIGNALS RESPECTIVELY BY PROVIDING AN ENABLING SIGNAL TO SAID OUTPUT SEMICONDUCTOR DEVICE TO CHANGE THE LATTER DEVICE TO SAID SECOND STATE AND THEREBY ACTIVATE SAID SOURCE OF A CAUTIONING SIGNAL.