Police diverted traffic away from a crash outside the town hall.
Traffic cones and police cars blocked off the Rickmansworth Road exit towards Hempstead Road following a collision between a lorry and a car outside the Watford Council building at around 11.15am today.
Police said the Honda was facing in the wrong direction.
Drivers were being directed away from the scene towards Watford Junction.
A black Honda Civic and white Volvo lorry are said to be involved. There was damage to the right side of the Honda.
A woman was being treated by paramedics .
The road is now fully open.
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