A group of travellers has set up camp in a patch of land in Borehamwood.
Police were called at about 9.20pm yesterday to reports that a caravan was blocking the highway at the A1 Barnet Bypass near the Holiday Inn. The travellers are believed to have moved onto the site at about 3pm yesterday.
When officers arrived, they found one caravan parked in a layby on the A1 and ten others parked opposite Wickes DIY outlet in Elstree Way.
But the caravans were not found to be guilty of any criminal offence as they were not blocking the road, meaning police had no power to move them on.
A police spokesman said it was up to the person who owned the land they were parked on to move them on.