Torrential rainfall in the Midlands has flooded the motorway network, bringing it to a grinding halt, just when the summer holiday season has begun in earnest. With the tailback of cars, vans and lorries stretching for more than 35 miles, thousands of motorists will be forced to spend a cold and uncomfortable night in their cars unless the motorway cops can get them moving again. As their search and rescue mission gets underway, however, the cops come across some unusual and illegal behaviour.