Emergency services are currently on the scene of an accident in Bushey Heath.
A moving car crashed into a stationary car in The Rutts at about 4.15pm.
Police, fire, and ambulance are still on the scene. A woman in her 70s has been freed from her car and is being treated for minor injuries.
The police are currently organising a recovery operation. The cars involved were a silver Mazda 6TF and a black Alfa Romeo Mito.