Input (grade 11): The section from the M1 to the M6 Toll split near Birmingham forms part of the unsigned E-road and the section from the M6 Toll and the M42 forms part of.
Output (grade 5): 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.