FASTag uses radio-frequency identification (RFID), which enables automatic deduction of toll charges at NHAI toll plazasA vehicle user will not have to pay any toll fee if he or she crosses a faulty FASTag reading machine, the National Highway Authority of India (NHAI) said in an official notification. As per NHAI, a zero transaction receipt will be issued mandatorily to a vehicle user who passes through malfunctioned electronic toll plaza machine on highways.
Ministry of Road Transport and Highways said, "If a vehicle user with a valid, functional FASTag or any such device with sufficient balance in the linked account has crossed a electronic toll collection plaza which is non-operational or malfunctioned then the vehicle user will be permitted to pass the toll plaza without making any payment".