A woman was racially abused in the car park of a M1 service station near Daventry.
The woman, who was Asian, was at the Watford Gap services on the M1 when her vehicle was involved in a minor scrape with another car sometime between 11.30am and 12.30pm on Monday, May 18.
A man, who was not involved in the incident, then approached the woman shouting racial abuse.
He was white, aged between 50 and 60, about 5ft 10in, balding and plump.
After shouting at the woman, he got back into his grey Volkswagen and drove away.
Witnesses, or anyone who knows anything about this incident, can call Northamptonshire Police on 101.
Alternatively, they can call the independent charity Crimestoppers anonymously on 0800 555 111 or use the anonymous online form at www.crimestoppers-uk.org.