M6
Longest (and normally busiest) motorway in the UK. Runs between Rugby (where it joins the M1 to London, and the Scottish border near Carlisle. The road continues (under the number M74) to Glasgow.
The road passes through the major industrial conurbations of the West Midlands (Birmingham) and the North West (Liverpool and Manchester).

The West Midland section (previously the busiest stretch of road in Europe, incorporating spaghetti junction) was bypassed in 2003 by the UK's first toll motorway, the M6 toll.
'There's a severe jam on the M6'