Police, fire and ambulance services were called to a collision involving three vehicles on the A5 between Flamstead and Markyate.
The crash took place near Junction 9 at around 1.47pm today, and involved a silver Vauxhall Astra, a white Ford Focus and a green Land Rover Freelander.
One person sustained a slight head injury and the ambulance service was called.
A crew from Harpenden Fire Station also attended following reports that smoke was coming from one of the cars. The crew made the scene safe and helped to administer first aid.
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