Starlink at 110km/h works fine if you are going in a straight line. It's when one does a whole bunch of turns navigating around suburban streets when service isn't great so have it configured as a primary link with my 4g array (https://ghuntley.com/internet) as the fallback for those type of scenarios. After the van stops moving it takes about 1 minute at max to relock and be functional as max speeds. Essentially what happens when lock is lost is the dish goes flat and looks right up (even when driving), finds a satellite and provides marginal connectivity, about a minute after that point it slants and provides exceptional connectivity.

From what I understand, in the US the FCC licensing for fixed location transmitters, relocatable transmitters, and transmitting while in motion are different (sorry can't remember the official terms). These stations may not be approved to transmit while in motion, and so Starlink may put technical restrictions in place to prevent use while moving. The license applications they put in for ruggedised terminals, intended for marine use and the like, requested ability to transmit in motion, but I think these are standard terminals (certainly not gimbled or gyro stabilzed) and aren't covered by that license. We'll have to wait and see until people start receiving stations and testing them out.