CHENNAI: Continuing its series of efforts to combat Covid-19 , the Tamil Nadu government on Friday announced closure of borders from March 21 to March 31, restricting inter-state transportation with Kerala Karnataka and Andhra Pradesh An official release said that certain transportation would be permitted, including vehicles transporting essential goods, such as milk, petrol, diesel, vegetables, medicines, ambulances and LPG cylinders.Freight vehicles and light vehicles such as those with passengers leaving for unavoidable reasons like death will also be allowed.Limited operation of government buses for essential mobility of public will be permitted. “However, commuters in all these vehicles will be subjected to scanning for virus. Also, the vehicles will be checked. Everyone should cooperate for the well-being of the nation,” the release said.