FASTag is a sticker attached to the windshield of vehicles. It uses Radio-Frequency Identification (RFID) technology, which is linked to the registered details of a vehicle and a bank account. This is used to automatically collect toll charges via entirely cashless transaction. The Ministry of Road Transport and Highways made FASTags mandatory for all vehicles from 1st January 2021. This is to boost digital payments and remove bottlenecks at highway toll counters.