The way the law is currently written, and vehicle that is fully electric, fuel cell, or CNG-powered is entitled for the AFV (Alternative Fuel Vehicle) plate which grants access to the HOV lane with one occupant at all times. You should be able to transfer said plate from car to car as long as: * You are going from AFV to AFV, and * The company you are purchasing from doesn't do any oddball AZ MVD hijinks. It is entirely possible that you will not be able to move your plate from one Tesla to another directly, as Tesla does seem to employ some other-than-normal MVD hijinks. Every other vehicle I've purchased in AZ, I either transferred my plate at the dealer when trading in or got my plate directly from the MVD. With the Tesla, for reasons I don't even want to try to unravel, the MVD sent the plate to Tesla in California, who then FedExed the plate to me. In doing so, they failed to file the paperwork for the vehicle I traded in, so I got a letter saying the registration of my trade-in was going to be rescinded. I had to go in myself to register the sale (and get my registration fee refund), which is another aberration from the norm.