The AA has joined the call for a long-term programme of investment in Britain's roads. Claiming that traffic troublespots will become worse every year without such investment, the AA has compiled a 'jam map' which highlights 20 areas on the road network most likely to cause motoring misery this summer.

Those areas are around Glasgow, north Lanarkshire, North Yorkshire, Cumbria, Cheshire, North Wales, West Wales, south east Wales, the West Midlands, Cotswolds, the Norfolk east coast, Dover/ Folkestone, Hampshire/ Wiltshire, the M5 between junctions 15-20 and at junction 31 and around the A30 Indian Queens junction in Cornwall.

Stress maps previously published by the Department of Transport show the pressure on motorways and trunk roads into the next century and confirm the AA's prediction that in 10 years congestion on key inter-urban routes will subject most journeys to frustrating delay and clog parts of major cities for most of each day.