A man leaned into a parked car in Suffolk, grabbed the driver by her throat and demanded money, police said.
The victim, a woman in her 20s, had pulled over in the layby opposite Kwik-Fit in Newmarket Road, Bury St Edmunds, when the alleged robbery took place at 12.30am on Saturday.
She gave the man her purse, from which he is said to have taken £95 cash. The man then threw the purse back and ran off in the direction of Bury town centre, police said.
The suspect is described as white, aged in his late twenties, with blond hair shaved at the sides and combed-over, and facial stubble. He was wearing a blue zip Adidas top and black jogging bottoms.
Police have issued an e-fit of the likeness of the man they want to speak to in connection with the robbery.
Anyone who believes they may know this man, or who has any information about this incident, is asked to contact the Bury St Edmunds Priority Crime Team on 101 quoting reference BU/14/2962, or Crimestoppers anonymously on 0800 555 111.
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