Re: Pedant Alert
"And uses the term "Non-Motorway Traffic" on signs directing such vehicles away from it."
And for good reason too! There are multiple sections of the A1 which are proper motorway standard and designated A1(M). It would be confusing to name those sections as an M road since they are "disjointed" and there's already an M1. Even more confusing would be the junction in Nth Yorks where the M1 ends as it merges with the A1(M) between Leeds and York :-)