A young man was left with blood streaming from his nose after being punched as he waited at a railway crossing.
The 22-year-old victim also suffered bruising in the attack at the Pevensey railway crossing, near Eastbourne.
He was stationery in his car with his family when the driver of a green Rover pulled up behind him, got out of his car and punched him in the face.
A police spokesman said the attack was unprovoked and lasted a few minutes in front of his frightened family.
The attacker, who was large and muscular, then drove off in his Rover, which contained four other people. Police are asking for help.
He was white, aged 40 to 50, with grey receding hair, 5ft 10in tall and with a northern accent. Anyone with information should call Eastbourne police on 0845 6070 999 or Crimestoppers on 0800 555 111.
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