M55 motorway (Great Britain)

M55
Looking east from Junction 4
Route information
Maintained by Highways England
Length	12.2 mi (19.6 km)
Existed	1958 – present
History	Preston bypass opened in 1958, remainder in 1975
Major junctions
East end	Fulwood, Lancashire
	M6 motorway
West end	Blackpool
Location
Counties	Lancashire
Primary destinations	Preston Blackpool
Road network
Roads in the United Kingdom Motorways A and B road zones

The M55 is a motorway in Lancashire, England, which can also be referred to as the Preston Northern Bypass. It connects the seaside resort of Blackpool to the M6 at Preston. It is 12.2 miles (19.6 km) in length.

The M55 has three lanes in both directions for most of its length. After leaving the M6 at junction 32, the road immediately interchanges with the A6. It then crosses the West Coast Main Line and Lancaster Canal before passing north of Wesham to meet the A585 at junction 3. It then continues west in a rural setting to meet junction 4, where the motorway ends and becomes the A5230. The western part of the M55, and the first few hundred metres of the A5230, occupy the route of the old Blackpool Branch railway line.

The first motorway constructed in Great Britain was the M6 Preston Bypass, opened in 1958. This ran from the current M6 junction 29 to the M55 junction 1. It was built as a two-lane route. In 1965 the M6 was extended north from what is the current day junction 32 to meet the Lancaster Bypass, and the M6 junction was rebuilt to its current design to connect the A6 at the now M55 junction 1. Due to increasing traffic, it was decided to provide a motorway link to Blackpool and this road was opened in 1975.

Some of the material for backfilling the new M55 was obtained from a nearby disused airfield at RNAS Inskip, where the runways were broken up and the land returned to agriculture. More material came from the Tootle Heights quarries in Longridge.