Delhi has significant reliance on its transport infrastructure. The city has developed a highly efficient public transport system with the introduction of the Delhi Metro,[1] which is undergoing a rapid modernization and expansion since 2006.[2] There are 16.6 million registered vehicles in the city as of 30 June 2014, which is the highest in the world among all cities, most of which do not follow any pollution emission norm (within municipal limits), while the Delhi metropolitan region (NCR Delhi) has 11.2 million vehicles. Delhi and NCR lose nearly 42 crore (420 million) man-hours every month while commuting between home and office through public transport, due to the traffic congestion.[3] Therefore, serious efforts, including a number of transport infrastructure projects, are under way to encourage usage of public transport in the city.[4]
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