The Abu Dhabi Investment Authority, a sovereign wealth fund, has expressed interest in taking up 50 highway projects on a toll-operate-transfer basis in India. Under this model, roads that have already been built by the National Highways Authority of India will be awarded to the private sector in lieu of an upfront fee. The private sector player will operate the national highway stretch and collect toll for a predetermined period. The total investment is pegged at Rs 350 billion.