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Watch Britain's Busiest Motorway online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

Britain's Busiest Motorway: Britain's Busiest Motorway is a six-part documentary series that goes behind the scenes with the hidden army of traffic controllers, patrol officers, engineers and maintenance workers who work tirelessly around the clock to keep the M25 motorway moving.