Short answers, pulled from the story.
George V laid the foundation stone of New Delhi on the 12th of December 1911 during the Delhi Durbar. This event marked a decisive shift from Calcutta, which had served as India's capital since the late nineteenth century.
Edwin Lutyens designed the central administrative area as a testament to Britain's imperial ambitions while Herbert Baker designed both the Secretariat building and Parliament House. These structures flank the Rashtrapati Bhavan and run parallel to the Rajpath.
The Supreme Court mandated restrictions on diesel car registrations until March 2016. All taxis were ordered to switch to compressed natural gas by March 2016 and vehicles older than ten years were banned from entering the capital.
The Delhi Metro network consists of ten color-coded lines serving 255 stations with a total length exceeding 390 kilometers. It serves Delhi, Faridabad, Ghaziabad, Gurgaon, and Noida within the National Capital Region.
The Constitution Sixty-ninth Amendment Act of 1991 declared the Union Territory formally known as the National Capital Territory of Delhi. An elected government system with wide powers came into effect in 1993 excluding law and order which remained under Central Government control.