The M1 motorway is a north-south motorway in England that connects London to Leeds, where it joins the A1(M) near Aberford. It is 193 miles (310 km) long and passes through the following counties:

• Greater London
• Hertfordshire
• Bedfordshire
• Buckinghamshire
• Northamptonshire
• Leicestershire
• Derbyshire
• Nottinghamshire
• South Yorkshire
• West Yorkshire

The main cities that the motorway passes through are Northampton, Leicester, Nottingham, Derby, Sheffield, Wakefield, and Leeds.