Police are hunting a man who indecently exposed himself to the woman as she sat in a car in Northampton.
It happened on Wednesday, February 27, between 8am and 9am in Wilberforce Street, Northampton.
A spokesman for Northamptonshire Police said: “A woman was sat in a car when she noticed a man turn into Wilberforce Street and look at her.
“The man then indecently exposed himself to the woman.”
The man is white, 6ft, between his late 20s and 30s and clean shaven.
He wore a black beanie hat, dark jeans, black hoodie and a mid-length dark bomber jacket.
Anyone with information can call police on 101.
Alternatively, information can be given anonymously to Crimestoppers on 0800 555 111.