The M6 is part of the unsigned E-road E24 from the M1 to the M6 Toll near Birmingham. The E5 joins the M6 Toll from the M42 and then uses the M6 to its north end at Carlisle. Then it continues to become the M74. The motorway is 230 miles (370km) long. This is 37 miles longer than the M1 motorway.