M6 motorway

The M6 is Britain’s longest motorway, stretching 370 kilometres from the Midlands to the Scottish border. It runs through England’s industrial heartland, passing cities such as Birmingham, Wolverhampton and Preston before skirting the Lake District. The motorway links major conurbations and ports, acting as a key route north–south and east–west. Its busiest stretches are in the West Midlands and Cheshire, where sections have been upgraded to smart motorway standards. The route follows the line of the old A6 in places, though it diverges where faster traffic demands motorway speeds. The motorway’s origins lie in the Preston By-pass, opened in December 1958 by Prime Minister Harold Macmillan. This first stretch soon closed for repairs after frost damage, but lessons learned shaped later sections. By 1971 the full route linked Rugby to Birmingham, including Bromford Viaduct, Britain’s longest viaduct at 5.6 kilometres. Junction 6 in Birmingham became known as Spaghetti Junction for its tangled ramps. Engineers also built the motorway through Shap Fell, where it reaches 316 metres above sea level, one of the UK’s highest motorway points. Today the M6 carries heavy traffic between Scotland and the south, with upgrades like the M6 Toll easing congestion near Birmingham. The Lancaster junction was rebuilt to improve access, widening the bridge over the River Lune. Near Gretna, the motorway ends just short of the Scottish border, where it continues as the A74(M) towards Glasgow. The route remains a vital corridor, linking ports, cities and industrial centres across northern England.