The Preston By-pass was Britain's first motorway. The by-pass was opened on 5 December 1958 by the Prime Minister, Harold MacMillan. It later became part of the M6 motorway.
The 8 1/4-mile motorway ran around the east side of Preston between Bamber Bridge, which is just south of Preston, and Broughton, which is to the north of Preston. The road was originally built with two lanes in each direction, but with room provided for an extra lane to be added at a later date. A hedge was planted along the length of the central reservation to help eliminate dazzle from the headlights of oncoming traffic at night. An extra lane was added in each direction in 1966 without any need to modify any of the existing bridges.
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