A police team headed by Superintendent Rachna Singh intercepted a car coming from neighbouring Markanam village in Villupuram district of Tamil Nadu on ECR road.
On checking, Rs 20 lakh was found inside the vehicle, police said, adding, the driver could not provide proper documents for the cash.
Police said the cash and the car were seized.
It was later handed over to the Income Tax department, they said, adding, the car driver is being questioned.