FASTags are prepaid rechargeable toll collection tags that allow automatic deduction of payment from the FASTag, usually affixed to your vehicle’s windscreen.

More about FASTags:

• The Ministry of Road Transport and Highways has agreed to ensure that FASTag data are collected during the registration or issuance of fitness certificates for vehicles nationwide.
• For payments directly from the prepaid or savings account connected to it the system employs Radio Frequency Identification (RFID) technology.
• There is no expiry date for FASTags, that is, they can be used as long as they are readable at the toll plaza and not tampered with.