A black Vauxhall Corsa was travelling along the St Albans Road towards Rickmansworth. As it approached the underpass which goes under the Town Hall Roundabout near to the Palmers Fiat Garage, it collided with a 16 year old boy.
The boy sustained serious head injuries and has been airlifted to the Royal London Hospital in Whitechapel by air ambulance.
Police are appealing for anyone who was in the area at the time and witnessed the collision to contact them as soon as possible by calling the non-emergency number - 101.
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