Its been recommended before.

A smart criminal will know where and how to disable it or falsify it.

Then some guy with an electrostatic sheet comes along and renders it useless. This tech is in use in any "Easy pass", "Sun Pass" toll type system for freeways. I dont think that the gains would justify the costs for such a system.

-Jeremy

then all your info, and the info of a bunch of other drivers is stolen when a smart theif sets up a good reader under a bridge, and we are all screwed..... better to just have the cop ask

I like this idea and my company currently does something similar to this for trucks entering port facilities and it works well. As for the objections above, though true, they're not different than the problems with current license plates--they're far easier to steal than RFID identities.

And for JM, my company also supplies cameras that take a picture of every car's license going through the turnpike RFID lane--if you use some else's RFID code and it doesn't match your license, (or if you blast-back at the RFID reader with no code) then you're license gets sent a ticket or a bill or whatever the operator does. We sell these systems we design and they're operated for profit.