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3 April 2012, 11:16 | Updated: 3 April 2012, 11:25
A woman in her twenties has been left seriously hurt after being hit in Hemel Hempstead by a car that sped off and didn't stop.
The crash happened at 6.25pm on Sunday 1 April 2012 in the Aycliffe Drive in the Grovehill area of the town.
Police say the car, which was silver, came off the road and hit the woman. It was driven off toward Cambrian Way in Highfield. The woman was taken to Watford General Hospital for treatment.
Detectives think a black box or transit type van was on a nearby roundabout at the time.
Kevin Deudon from the Hemel Hempstead Local Crime Unit said: "I would appeal for witnesses, and in particular, the driver of this black van to contact police. This person may be a key witness and have vital information which could greatly assist the investigation.
"I would as like to speak to anyone who has information about the collision to contact police. If you were driving the silver vehicle described I'd ask you to make contact with police at the earliest opportunity so we can establish what happened."
Anyone with information is asked to call the Hertfordshire Police non-emergency number, 101.