Motorists have been urged to avoid the A3 in Guildford after a pedestrian was hit by a car.
Both carriageways and slip roads have been closed following the incident, which happened at about 3.15pm on the northbound carriageway between Guildford Cathedral and Denis Roundabout.
The air ambulance has been at the scene and police said the southbound carriageway would reopen once it left.
Police have urged drivers to take alternative routes.
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