An eyewitness said a van driver uttered an expletive as he fled from the scene of a crash on Scotforth Road.
It was reported the van driver sped off in his vehicle after the crash.
Police are now looking for the van after the three-car crash in Lancaster left one person injured.
The light blue van drove away from the scene following the incident on Scotforth Road at around noon on Wednesday.
Staff from a nearby hairdressers tended to the OAP until the emergency services arrived shortly after.
Traffic was diverted around the collision at around 11.45am.
Emergency services freed a person who was trapped and had suffered a leg injury.