Backup traffic signal management system and method
US5659305A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1995 |
| Grant date | Aug 19, 1997 |
| Priority date | — |
| Expiry date | Mar 17, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08G1/097
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An backup vehicular traffic control system employs a connector-switch including a normally-closed electrical switch connected in series between a traffic signal and a primary control system. In the event of an emergency condition, such as a failure of the primary control system and/or failure of a primary power source, or in the event of a shutdown condition, such as a shutdown of the primary control system and/or shutdown of the primary power source, a connector is manually connected to the connector-switch. The normally-closed electrical switch is opened when the connector is connected to the connector-switch, disconnecting the primary control system from the traffic signal. Also upon the connection of the connector to the connector-switch, an auxiliary control system coupled to the connector is coupled through the connector and connector-switch to the traffic signal. After being connected, the auxiliary control system assumes control of the time of operation of the traffic signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.