What I was talking about did not have the cars "connecting" as this is one of the few applications that actually calls for broadcast.

I'm against allocating spectrum for applications, of course. Spectrum is level 0 in my book, in some ways level -1 as it shouldn't exist, though we won't get there for a while. There should be a system for mobile vehicles that could be used for many applications, including this, and the protocol used within it should have a multicast ability for data (like traffic light changes), news, weather etc. that is for everybody. 802.11p is for more than just traffic lights of course, but as I see it it should be like the internet, with the radio stations and every app using it. The less about the apps you code into the spectrum and the lower level protocols, the better.

As I have written before, the idea of allocating special bands to "official" use is actually counterproductive. Opening up more and more spectrum to general use causes industry to develop general purpose radios that do 10 times as much at 1/10th the price, resulting in more than enough resources for both official and unofficial purposes. "Official" status of packets can be added by signing them, since that's the only secure way to do it even in official bands.