[MrNightdrive]

Always interesting to read what you're working on!
I did some playing around reading Car IDs a few years ago. iD 6 was the one least likely to be read at speed as the frequency was quite low compared to the window of opportunity.
So I presume ID 7 and above are switched to using higher frequencies?
I can't imagine the new IDs being squeezed between existing ones... Too much potential for error. Doppler shift must come into it at some point.