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Men in yellow help boys in blue...
The Highways Agency has been given the duty of dealing with accidents like this. We sent senior reporter Dan Ilett to Surrey to get the lowdown on policing the M25.All photos: Dan Ilett
Meet Sarah, an operator at the Highways Agency (HA) Regional Control Centre in Surrey.
When someone contacts the HA, either through emergency phones on the motorway or via the emergency services, Sarah is one of the people who handles the call.
On her monitors she is able to pinpoint the exact location of a distress call.