A traffic policeman was dragged on a car's bonnet for around 20 km in Navi Mumbai town after he tried to stop the vehicle driver who had consumed drugs, officials said on Sunday. The incident took place in Vashi area at around 1.30 pm on Saturday when the 37-year-old police naik, Siddeshwar Mali, was on bandobast duty on account of the visit of Union Home Minister Amit Shah, they said. The 22-year-old car driver, identified as Aditya Bembde, was arrested and booked on charges of attempt to murder and under provisions of the Narcotic Drugs and Psychotropic Substances (NDPS) Act, the police said.