This is a problem in Texas as well. We have regular roads that are up to 75mph speed limits that are not always divided and not restricted access.Yes it is crucial. That and hills.
50mph limits on residential-feeding parkways and also surface streets through commercial areas are extremely common in San Diego. People go 55-60mph.
Anyway it’s apparently very challenging for FSD v12.
This has often caused issues with all versions of FSD to date.