The A601(M), a 500m long connection between junction 35 on the M6, and the B6254 near Over Kellet (The "Carnforth Quarry Link Road") consists only of a single 7.3m carriageway and two 1m wide strips. Its overall width is about 50 feet (15m). The background to this road is described on "The Lancaster by-pass section of M6 and the Carnforth link roads A601(M)" page. The M6 originally terminated on the A6 north of Carnforth. When it was extended northwards, the link through to the A6, which was of course built to motorway standard, was effectively "cut off", and this was redesignated the A601(M). The roundabout which connected the two motorways was automatically a "special road" by virtue of the fact that only motorway traffic could get to it. When the "Quarry link" was added, this provided a direct connection to a motorway, and in order to prohibit non-motorway traffic from using it, it had to be designated as a motorway itself. It therefore also became the A601(M). The route numbering is illogical, because the A601 is, in fact, the Derby Ring Road.