FASTag mandatory from February 15 midnight: How it works, who is exempted, and other questions answered Those vehicle users who fail to install FASTag on their vehicles would be charged double the toll amount on national highways. Here's everything you need to know about FASTags. In November 2020, the ministry had issued a notification making FASTag mandatory by January 1, 2021. The use of FASTag will be mandatory from February 15 midnight, said the Union Ministry of Road Transport and Highways. Those vehicle users who fail to install FASTag on their vehicles "It has been decided that all the lanes in the fee plazas on national highways shall be declared as 'FasTag lane of the fee plaza' with effect from midnight of 15th /16th February 2021," the statement said.