 The crew, of up to 50 people, includes a first aid team, fire crew and personnel equipped to monitor for radiological hazards.The convoy maintains contact by radio and telephone with Task Control, MDP Central Control Room, Wethersfield, Essex, which monitors its movement, and with the civil police forces in the affected areas.Police forces are notified at least 24 hours in advance of a convoy being routed through their area; this enables them to advise the convoy about any local traffic problems.