There are no byways open to four whell vehicles at totternhoe. There is one that is open to motorcycles on the road from Dunstable down the hill but I think that even that one os seasonal.
The other byways are all closed, though you may sometimes see members of the local landy club using them. This is because those byways actually cut across their land and they use them for accessing areas on whicj they hold their own local events.