Millions of motorists rely on the A1 for journeys up and down the country every week, but many are unaware of the vast scale of work needed to keep the road open and traffic flowing.A1: Britain's Longest Road meets the men and women who work around the clock on Britain's longest and most iconic road, ensuring the traffic keeps moving and the public is kept safe. Spanning nearly 400 miles of the A1 from London to Edinburgh, the series focuses on the work of the police, traffic officers and emergency response teams on both sides of the border as they deal with some of the thousands of incidents which affect the road every year.