| 摘要 |
<p>An optical traffic preemption detector as shown in Figure 2 for detecting pulses of light emitted by an approaching emergency vehicle and providing 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. The detector 16 includes a housing having a base 20, at least one detector turret 22, a cap 26, and a detector circuit 62 which further comprises a circuit board, a photocell 65 with a lens 64 placed over the photocell, and circuitry 96, 98, 100, and 102 to produce an output signal. <IMAGE></p> |
