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India's vast population, industrial growth and rapidly growing middle class - with an insatiable appetite for road and air travel - put massive pressure on the country's infrastructure.   Everywhere in India, visitors encounter traffic jams, potholed roads and crowded airports and railway stations.   But increasingly they also see huge construction projects from metro systems to elevated expressways and airport terminals in all the major centres.   India is undertaking a substantial programme of investments in infrastructure that will underpin its growth in years and decades to come.   Historically, India has invested less in infrastructure than some other emerging markets and the major state-run projects were plagued with delays and cost over-runs.   But in recent years the Government of India has accelerated the pace of investment by opening the infrastructure sector to private investment through Public Private Partnerships.   Why is it important ?   Over the next 15 years the government plans to invest US$320 billion in upgrading...