I'm talking mainly about carpool bridge tolls (which is what I use most often personally). You don't need a special toll tag to use them (it doesn't even say you need a toll tag at all). You just need the decals displayed, an account in good standing (which they can charge also based on your plate) and travel through the designated carpool lane. In such a case, obviously it's the camera that determines if you are eligible (same with determining number of occupants).
It is my speculation having both in the front actually gives them a better chance at catching at least one photo with the sticker clearly visible. The front back configuration they may have missed both stickers depending on how the front/rear cameras are placed relative to the car.
I think the purpose of the cameras are for taking pictures of license plates not bumpers. That's how they know where to send the bills to people that don't have fastrak or CAV decals.
Plus the cameras can't count accurately count how many people are in the car when there are kids and/or babies in the backseats. Even more so if the car has tinted windows.
Have you crossed a bridge without a toll tag? What were you charged?
"To receive carpool discounts at toll bridges, you are required to use the designated carpool lane with a valid FasTrak toll tag. Either a FasTrak Standard, FasTrak Flex or FasTrak CAV toll tag will work."
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