Are there any negatives to preemption-equipped intersections that are programmed for “Restricted Access” (meaning that only custom-encoded transmitters can activate them)?
Yes. Priority Green does not offer transmitter ID encryption of its devices at this time due to the logistical problems and liability often created where such systems are deployed. If a preemption-equipped traffic signal is programmed so that it permits access only to predetermined vehicles, every single traffic signal within the territorial boundary of the equipped emergency vehicle must be similarly equipped. The programming of traffic signal preemption detector electronics is almost never performed by the departments who must make use of them, making the logistics of maintaining such a system cumbersome, impractical, and very expensive – particularly when new vehicles are equipped with transmitters and every traffic signal must then be programmed to accept the new vehicles – logistical responsibilities that responding departments cannot directly control. Liabilities arise when bordering departments, which may have vehicles equipped with preemption transmitters, cannot gain access to
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