New Delhi, Nov 2 (UNI) The National Highways Authority of India (NHAI) has prohibited contractors from extracting soil for construction from land acquired for highway interchange loops, ramps, and similar areas, saying that indiscriminate excavation is damaging land intended for drainage, plantation, and other highway purposes. The restriction will apply to all national highway projects, including those under construction, according to a policy circular issued by the authority. NHAI said it had observed instances of contractors and concessionaires removing soil from acquired land to meet earthwork and filling requirements during highway construction. Such excavation can leave depressions, cause waterlogging and…