Optical traffic preemption detector
US5202683A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1991 |
| Grant date | Apr 13, 1993 |
| Priority date | — |
| Expiry date | Jun 24, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08G1/087
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An optical traffic preemption detector detects pulses of light emitted by an approaching emergency vehicle and provides an output signal which is processed by a phase selector. The phase selector can request a traffic signal controller to preempt a normal traffic signal sequence to give priority to the emergency vehicle. A detector assembly is mounted in proximity to an intersection and can have multiple detector channels. A detector channel can have multiple photocells. A detector housing includes a base, at least one detector turret and a cap. A detector channel circuit includes a circuit board, a photocell with a lens placed over the photocell, and circuitry to produce an output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.