Britain's congested motorways are dangerous places; wall to wall traffic and high speed drivers are a deadly combination, and a lapse of judgement can mean the difference between life and death. In Cheshire the motorway cops are dealing with a high speed crash which has left the fast lane blocked to traffic. Meanwhile in Humberside a lorry on fire has left both lanes of the M180 impassable as traffic is brought to a standstill. Jamie Theakston narrates.