A woman was repeatedly punched in the face while in her car in Braintree.
The victim, who is in her 40s and from the Braintree area, had stopped her car to give way at Goldings Way near the junction with London Road at around 4.30pm on Tuesday, May 20.
She was then punched in the face numerous times by a pedestrian through the open driver's window.
Paramedics were called and checked the driver, who was badly shaken and had bumps and bruises but did not require hospital treatment.
Extensive local enquiries have been carried out to identify the suspect but there has been no trace of him.
Investigating officer PC Daniel Smith said: "This was an unprovoked assault by a man who walked across the road and punched the woman when she stopped at the junction. She was punched about nine times and at one point pulled by the hair.
"This happened in a busy residential area and we hope that local people or other drivers might have seen this man in the area at the time."
The man was white, thought to be aged in his 30s, about 5ft 10in tall and of slim build. He had long brown hair and a beard. He was wearing a dark-coloured polo shirt and combat trousers.
Anyone with information should contact PC Smith at Braintree police station on 101 or call Crimestoppers anonymously on 0800 555 111.
