A601(M) motorway

A601(M)
The former southern end of the A601(M) (now the B6601)
Route information
Length	1 mi[1] (1.6 km)
Existed	1960–2023
History	Constructed 1960
Major junctions
North end	A6
Major intersections
South end	1987-2020 B6254 between Over Kellet and Carnforth 2020-2023 M6 J35
Location
Country	United Kingdom
Road network
Roads in the United Kingdom Motorways A and B road zones
← A404(M) → A627(M)

The A601(M) was a motorway in Carnforth, Lancashire, England. It was at the time of its downgrade a 1.3 miles (2.1 km) long dual carriageway, meeting the M6 at Junction 35. It is no longer a motorway but remains open, as part of the B6601 and A6070.

Originally built in 1960 as the northern terminus of the M6 on the A6, the A601(M) became a spur to the M6 in 1970 when the mainline of the motorway was extended north. A short single-carriageway extension to the south of Junction 35 was opened in 1987, to connect to the B6254, and the road was renumbered the A601(M). This southern extension was reclassified as the B6601 in 2020, and the remainder of the motorway became part of the A6070 in 2023.