The M1 is a major motorway in England connecting London to the city of Leeds in northern England, but also linking several important towns and cities along the way, including Milton Keynes, Northampton, Leicester, Nottingham, Mansfield and Sheffield. It also links to the M6 and M45 motorways near Rugby, the M25 near Potter's Bar, the M69 at Leicester, the M62 near Leeds.

The motorway was one of the first to be built in the United Kingdom. It is around 200 miles (300 km) long and was constructed in stages between the 1950s and 1970s.

It has been extended to the east of Leeds to meet the A1(M) near Wetherby, providing a more direct link to the north and Scotland.

Route

• Junction 1 - west of Golders Green
• Junction 2 - west of Finchley
• Junction 4 - south of Borehamwood
• Junction 5 - east of Watford
• Junction 6 - south of St Albans
• Junction 6a - for M25
• Junction 7 - west of St Albans
• Junction 8 - east of Hemel Hempstead
• Junction 9 - west of Harpenden
• Junction 10 - south of Luton
• Junction 11 - west of Luton
• Junction 12 - east of Toddington
• Junction 13 - east of Milton Keynes
• Junction 14 - north of Milton Keynes
• Junction 15 - south of Northampton
• Junction 16 - west of Northampton
• Junction 17 - for M45
• Junction 18 - east of Rugby
• Junction 19 - for M6
• Junction 20 - east of Lutterworth
• Junction 21 - for M69, south-west of Leicester
• Junction 21a - for northern Leicester
• Junction 22 - east of Coalville
• Junction 23 - west of Loughborough
• Junction 24 - west of Kegworth, for East Midlands Airport
• Junction 24A - for A50
• Junction 25 - between Derby and Nottingham
• Junction 26 - west of Nottingham
• Junction 27 - northwest of Hucknall
• Junction 28 - west of Sutton-in-Ashfield, Mansfield
• Junction 29 - southeast of Chesterfield
• Junction 30 - northeast of Chesterfield
• Junction 31 - east of Aughton
• Junction 32 - south of Rotherham
• Junction 33,34 - between Rotherham and Sheffield
• Junction 35 - east of Chapeltown
• Junction 36 - west of Hoyland
• Junction 37 - west of Barnsley
• Junction 38 - west of Royston
• Junction 39 - west of Crigglestone
• Junction 40 - west of Wakefield
• Junction 41 - north-west of Wakefield
• Junction 42 - for M62, J29
• Junction 43, etc - for Leeds

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There is also an M1 motorway in Northern Ireland. It runs from Belfast to Dungannon, bypassing Lisburn, Lurgan, Craigavon and Portadown on the way.

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The M1 motorway in the Republic of Ireland consists of several short sections built as bypasses of sections of the N1 road, running from Dublin toward Belfast.