The motorway is 230 miles (370km) long. This is 37 miles longer than the M1 motorway.
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At 231 miles (370km), the M6 is the UK's longest motorway. It runs from Catthorpe (junction 19 on the M1) to the Scottish Border. The M62 is the highest motorway in the UK.
Drivers on stretches of the M1, the M6, the M5 and the M602 have been limited to a top speed of 60mph in a bid to ascertain if driving more slowly helps reduce emissions.