A woman was threatened with a knife by a pedestrian who forced her to stop her car in Northampton.
The 34-year-old was driving along Salthouse Road on the Brackmills industrial estate when a man stood in the road, forcing her to stop.
He then opened the driver's door and threatened her with a knife but she drove off with the door still open.
The man was described as white, about 40-years-old, 6ft 8in, with brown, greasy, shoulder-length hair.
He was unshaven and wearing a multi coloured woollen jumper.
The woman, from Roade, was not injured in the incident on 12 December.