Abstract: [Problem] A parking brake control device can ensure required braking force and reliably allow release even if an automatic pressurization function that increases a W/C pressure is malfunctioning, regardless of operation of a brake pedal. [Solution] If an ESC is malfunctioning when a locking control or a releasing control of a parking brake is being performed, a depression request for a brake pedal is output to a driver. As a result, when the ESC is malfunctioning, namely, even if an automatic pressurization function of a service brake is malfunctioning, a W/C pressure can be increased by the driver depressing the brake pedal. Thus, it is possible to ensure required braking force at times when the locking control is being performed, and also possible to reliably release when the releasing control is being performed.

Abstract: A system for traffic signals for one-side passing, which realizes efficient traffic control during abnormal operation of detectors or the night with little traffic density. Traffic signals 6 and 7 are provided with detectors 8 and 9 for detection of passing of vehicles respectively. Both traffic signals repeat traffic lighting in a cycled manner such as green-red, red-red, red-green and red-red by a sensitive controller 10. Owing to an ill-detection switching device 71, if there is no detection signal input by the detector of one traffic signal within a switch holding time after detection signal is input by the detector of the other traffic signal, the green lighting of one traffic signal will be shifted to a fixed-cycle operation until detection signal input by the detector. The traffic signal shifted to the fixed-cycle operation will be restored to the sensitive operation if the detection signal is input by the detector.