A driver who was allegedly high on drugs has led police on a chase in western Sydney that reached speeds of almost 200km/h.
Highway patrol officers say they noticed a car speeding on the M4 Motorway at South Wentworthville just before 9.30am (AEST) on Saturday.
The driver refused to stop when police flashed their lights.
They began a pursuit which went on for 10km with the car allegedly overtaking eight trucks and 17 cars at speeds of up to 197km/h.
The pursuit ended at Rouse Hill where police arrested a 36-year-old Annandale man.
He was immediately suspended from driving and had his licence and registration plates confiscated.
Police expect to charge him with a range of laws including driving under the influence of prohibited drugs.