 Leaving Antrim town, it goes past Massereene and Shane's Castle, then heads towards Randalstown where it crosses under the old (now dismantled) railway line between Antrim and Cookstown, and almost immediately afterwards the road crosses over the River Maine.Up until this point the A6 runs parallel with the M2 and M22 motorways, which since their construction in the 1960s/1970s have removed the vast bulk of the cross-country traffic from the A6.A mile west of Randalstown the A6 meets with the M22 motorway at Randalstown West junction (a non-motorway junction), and from this point onwards the A6 carries traffic bound for Mid Ulster and the North West.