Patent ID: 11866046
Assignee: nan
Field: Control (Instruments)
Classification: CPC B  G | IPC B  G

Claim 0:
1. A method of diagnosing traffic control systems, the method comprising:
recording one or more images of a visual traffic control display (VTCD) of a traffic control device (TCD) of a computer-based traffic control system during a diagnostic period;
obtaining an expected state of the VTCD during the diagnostic period;
processing the one or more images to identify an actual state of the VTCD, the actual state of the VTCD being contemporaneous with the expected state of the VTCD, by the computer-based traffic control system;
comparing the actual state of the VTCD with the expected state of the VTCD to determine whether a mismatch exists between the actual state of the VTCD and the expected state of the VTCD, the mismatch indicating a malfunction of the TCD or of a sensor connected to the TCD; and
performing at least one of a corrective action and a remedial action in response to the malfunction;
wherein the step of recording the one or more images is performed by a camera external to the TCD.