Former cricketer and MP Navjot Singh Sidhu today had a tiff with security guards at a highway toll gate near Nellore after his driver ignored their warning to stop the car. Siddu was going from Chennai to Venkatachalam in Nellore district to participate in a function organised by senior BJP leader M Venkaiha Naidu. The security guards manning the highway toll gate signalled Siddu's car to stop for payment of toll,Nellore rural Deputy Superintendent of Police (DSP) Balavenkateshwar Rao told PTI over phone. When the driver did not stop the car,a security guard hurled a stone at the car which prompted the MP to get down from the car and had verbal argument with them,the DSP said adding the car did not have an MP sticker,he said. When asked whether the security guards were booked,the DSP said that no complaint had been received at the concerned police station.