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

Claim 2:
3. A method of diagnosing traffic control systems, the method comprising:
obtaining 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, wherein the step of obtaining the one or more images is performed through a camera external to the TCD, the camera external to the TCD being part of a camera-equipped device external to the TCD;
obtaining one or more expected states of the VTCD during the diagnostic period;
processing the one or more images to identify one or more actual states of the VTCD during the diagnostic period, by the computer-based traffic control system;
comparing the one or more actual states with the one or more expected states to determine whether a mismatch exists between at least one actual state of the one or more actual states and an expected state of the one or more expected states that is contemporaneous with the at least one actual state, the mismatch indicating a malfunction of the TCD or of a sensor connected to the TCD;
operating a state machine of the TCD to control traffic through one or more visual traffic control displays of the TCD, the one or more visual traffic control displays comprising the VTCD; and
in response to the mismatch, performing at least one action responsive to the mismatch, the at least one action responsive to the mismatch being a remedial action or a corrective action.