M is for Motorway. Supposed to be quicker to get from one place to another as there are no crossroads, crossings, traffic lights, pedestrians, cyclists, more lanes in each direction, no parking allowed.
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Stretching from London to the north, the M1 is Britain's first full-length motorway and possibly its most iconic. Sticklers will point out that the Preston Bypass was the first motorway, and they're right. It was part of the M6, but only eight miles long.
The first section of motorway built in Britain was the Preston Bypass in Lancashire, which opened in 1958 and is now part of the M6 motorway. However the M1 was Britain's first full-length motorway and opened in 1959.
The M1 motorway connects London to Leeds, where it joins the A1 near Aberford, to connect to Newcastle. It was the first inter-urban motorway to be completed in the UK; the first motorway in the country was the Preston Bypass, which later became part of the M6.
In later years, as the M1 was extended southwards into London and the M25 was built, the M10's original purpose eroded. It was sometimes suggested that the motorway might have been extended to meet the M25 at junction 22, but this was never proposed.