Traffic control malfunction management unit with per channel red enable
US7378987B2 · kind B2 · utility
0Cited by
4References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 21, 2003 |
| Grant date | May 27, 2008 |
| Priority date | — |
| Expiry date | Jan 22, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08G1/095
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method and apparatus for monitoring for Red Fail faults in a traffic signal control system. Traffic control signals generated by a traffic control unit are grouped into channels. Certain channels are specified for Red Fail testing in which all lights in a given channel are inactive at the same time. Channels which are not specified are not subject to Red Fail testing, but other conflict testing can still be performed on these unselected channels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.