Grande Prairie RCMP is warning drivers to be on the alert for a man impersonating a police officer. 

On Thursday night around 11:30 p.m. a woman was pulled over on Highway 2 near Webster Road by an unmarked police vehicle with lights and sirens. .

A man — not in uniform — had signalled her to stop from his unmarked sport utility vehicle. He asked for her identification, and requested she get out of her vehicle.

When he didn't provide a badge number or his name, the woman drove away unharmed, police said in a statement late Saturday.

The suspect is described as a tall Caucasian male with medium length hair, unshaven and unkept, wearing a work coat and black pants.

Police caution motorists to be vigilant, asking for ID from police officers if there is any suspicion. They can also request a marked police car to attend.