Denis Chick, from road analysts Traffic Master, said queues would be enormous. "Road congestion will be very bad from today, with hotspots around the M25 West sector, M4 and M1," he said. "We expect it to be around 50 per cent worse than a bad Friday evening with heavy traffic on the M4 as far as Swindon. Even tomorrow, traffic will be heavy from at least 8am as millions of vehicles set off."