An OPP officer has been charged under the province's street racing laws for speeding in her police vehicle while on duty.

The officer, driving an unmarked car, was stopped by Brant County OPP on Highway 403 going 165 km/hr in a 100 km/hr zone.

"The subsequent investigation found that the officer was not within the lawful execution of her duties at the time," police said.

Det. Const. Heidi Fischer was charged with driving 50 km/hr or more over the posted speed limit.

Her licence was suspended for seven days and the OPP unmarked vehicle was impounded for seven days.

Fischer is a four-year member of the OPP posted to the Provincial Operations Intelligence Bureau at General Headquarters in Orillia.

She will appear in Provincial Offences Court in Brantford on March 24.