New Delhi, Nov. 22 -- India's long-delayed attempt to frame a vehicle scrappage policy has hit another roadblock.

This time, federal policy think-tank NITI Aayog has raised concerns on a draft voluntary vehicle scrappage policy prepared by the road ministry that seeks to phase out old and polluting automobiles.

The government hopes the policy laced with incentives would drive vehicle sales and help the auto industry that has been experiencing sluggish demand for about a year.

A person aware of the development said NITI Aayog has raised concerns on the draft policy prepared by the Nitin Gadkari-led ministry concerning the definition of the life or age of a vehicle that will prompt their owners to scrap them, saying it may result in an eco...