New Delhi, Aug. 25 -- The road transport and highways ministry on Tuesday said it has made the use of electronic toll collection device FASTag mandatory for availing any discount in toll charges, including a return journey within 24 hours. The step has been taken to encourage the adoption of digital payments.

"In order to further promote digital payments on the fee plazas on the national highways, it is decided that discount for users who make return journey within 24 hours and all other local exemptions shall be provided only if the vehicle carries a valid functional FASTag," an official statement said.

This means that in cases where there is a discount available for a return journey within 24 hours, the passenger may not require a pri...