High speed driving, wall-to-wall traffic and hazardous weather conditions can make Britain's motorways a dangerous place. Just one small lapse in judgement can mean the difference between life and death.
Real life footage from police forces around the country demonstrates that motorway cops have to deal with something new every day from major accidents to car crime.
The series also offers an insight into important issues from road safety to drink driving, to the problems caused by an increasingly congested network. Narrated by Jamie Theakston and told through the eyes of the men and women who police the roads.