HOV2 requirements are not easily verified even with eyes on the passing cars. Police successfully ticket cheaters at off ramps, but that is costly and erratic. Since passenger occupant-sensors are in place in many cars (to set the air bag deployment appropriately), the fact that an 80' person is on board with the driver can be electronically available to EZPass device on the windshield. When that car passes thru entry to a HOV2 lane, no fee is charged. Any EZPass reading no passenger would pay a fee. Neither car would stop or significantly slow to accomplish this.
Drawback: an 80' block can ride and register as a person. Can technology evaluate finger pulse pressure against the seat belt every 15 minutes or measure breath? And if HOV2 become HOV 3 or 4, can the technology move to the back seats?
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I worry about cheaters beating the system, but I like the idea of information beaming out from cars. If I ran an auto-insurance company, I could pay good drivers to use automated monitors like the semi's use. It might be good, also, to prove in court how save you drive. As for HOV, if more are built then it might be worth automating. I'd consider video cameras at on ramps & maybe on the freeway as well.
Say, an infant counts as a person, would that be a big problem?
About the 80' requirement: I think it would be easier to amend the definition of HOV to specify "adult", as in two working people, than to find a way to verify the presence of a baby or small child. Dogs, too, could tip the scale and ride as aduls, but hey, the driver would have to tie the dog down or risk failing the weight test at just the wrong moment!