Interesting: Website on Mumbai's vertical transport structures

Vertical Urbanism is an incredible website. From the About page:

This site maps the landscapes of elevated road highways – flyovers – and elevated pedestrian walkways – skywalks – across the Mumbai Metropolitan Region in Western India. Both flyovers and skywalks have become a highly visible feature of Mumbai’s recent rapid urbanisation. The number of flyovers increased from 13 in 1997 to over 60 by 2009, while the first skywalks were constructed in 2008. Many more projects are ongoing and proposed. By assembling and categorising photographs, videos, audio-clips and text, this site allows users to explore some of the new and diverse urban worlds created through flyover and skywalk construction. All material was collected between April 2009 and January 2010 by Andrew Harris with the assistance of Savitri Medhatul. The website was devised by Andrew Harris and created by Sanjay Bhangar.The research was funded by the UK’s Economic and Social Research Council and the Urban Laboratory of University College London.