Motoring misery and delays are around the corner when schools break up. The Great British getaway to seaside resorts and beauty spots will mean almost 19 million cars on the road at the weekend, warns the RAC. Despite rocketing petrol prices, Britons’ appetite for a summer break is likely to mean bumper-to-bumper traffic on motorways and major routes. The worst jams on Friday, Saturday and Sunday are predicted to be on the M25, A303, M4 and M5.