Dogtrousers
Kilometre nibbler
Even if he did, he'd still be wrong.Does he mean a dual carriageway?
Anyway, there are all kinds of A roads. Big uns and littluns. Same for dual carriageways. Some DCs are fine, and some are motorways in all but name, but lacking the hard shoulder.
But all are legal to ride on, many are perfectly safe and all would be perfectly safe if drivers could be trusted to drive within the law.