State police conducting routine motor vehicle enforcement Friday night on I-84 arrested three men on heroin possession charges after finding more than 170 bags of the drug in their vehicle. The incident started at about 9:15 p.m. when troopers noticed a car with equipment violations as it traveled on I-84 near Tolland. They followed the car off the highway and stopped it on Rte. 74 in Willington. As troopers were talking to the occupants, they admitted they had drugs in the vehicle. Police found a total of 170 bags of heroin in the car. The driver, David McKnight, 53, of the Danielson section of Killingly, was charged with possession of heroin with intent to sell and a brake light violation. He was held overnight on a $75,000 cash bond and will be arraigned in Superior Court in Rockville on Monday. Anthony Falzone, 24, of Norwich, was charged with possession of heroin, as was Ryan LaFountain, 27, of Danielson. Both of them were released after posting $10,000 bonds. They are scheduled to appear in Superior Court in Rockville on Jan. 24.