On the one hand there will be vehicles with moderate speed and/or low weight, so low kinetic energy.
This may be Zac Goldsmith's vision
These exist too
and I think it's really clear that high kinetic vehicles like the following should be segregated away from these soft, squidgy things as far as possible
What doesn't make sense is to provide really fast routes for high kinetic energy vehicles but wiggly, inconvenient, slow routes for low kinetic energy vehicles.
After all, for most of our short, daily journeys we can use low kinetic energy transport, and if we want to go a long distance something like this makes sense to use for the majority of the journey: