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The reason often given for all that idling is to keep the batteries up because the radios draw so much. I think the waste from the amount of idling they do is criminal.
I would think that we have the technology to make radios that draw so little idling could be reduced/eliminated. There are so many possibilities: sleep mode, miniaturization of the circuits, having a separate battery for the radios ala campers such that there is no possibility of being caught with a low cranking battery, or even a dedicated micro diesel genset for all their gear and even HVAC- save the big V8 lump for pursuits, etc.
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