The National Highways Authority of India (NHAI) on Wednesday moved the Supreme Court seeking modification of its guidelines mandating forest clearance prior to environmental clearance, saying the related procedures have delayed and stalled 22 important projects worth over R20,000 crore.

The highway authority has also sought a direction to the ministry of environment and forests (MoEF) to modify its office memoranda (OM) of March and April 2011 so as to delink the two clearances in respect of widening of national highways.