Police are appealing for witnesses to the assault which happened in the early hours of November 10 in Bexhill Road, St Leonards.
Officers said the altercation was on the stretch of main road between Bulverhythe Road and Amsterdam Way at around 2.15am and involved a woman who was driving a dark coloured vehicle and a man who was on foot.
The man is reported to have thrown something at the woman’s moving car.
Read more: Violent and controlling man viciously attacked woman
She got out to challenge him and was punched to the ground. Her face was injured.
Her attacker then left the scene on foot in the direction of the Harley Shute traffic lights.
He was about 6ft, with dark facial hair, holding a black rucksack, and wearing a black puffer jacket.
Anyone who saw what happened or captured any relevant dash cam, doorbell or CCTV footage, is asked to report it online or call 101, quoting serial 123 of 10/11.
