I've long had this fantasy of a smart road pilot program wherein manufacturers would partner with governments (or toll road owners in some places?) to make self

I've long had this fantasy of a smart road pilot program wherein manufacturers would partner with governments (or toll road owners in some places?) to make self-driving-only smart lanes, where you have to surrender control but the car goes 120+mph. I imagine getting even a handful of popular longer routes enabled for that would be quite popular.