They exists, they are called tracks and have trains running on them. Joking aside, there probably will not be special roads since the cars need to be safe in c

They exists, they are called tracks and have trains running on them. Joking aside, there probably will not be special roads since the cars need to be safe in case the roads fail anyway. And I don't think anyone will be for these new roads that no cars can use so it is also a chicken and egg problem.