There could be a bus right to the front door of my now adult DS2's college (actually on farmland down a 1km single lane track) but he wouldn't be able to use it unaccompanied.
It's pretty appalling that LA's are withdrawing transport for over 16s with SEND. Compulsory school/ education age is up to 18, now, and those with the most severe difficulties have the EHCP until they are 25. All the in-county education options for DS2 were farm based.