On the lines of this water index project, how about a separate group of people come forward to build a public transportation index for Bengaluru? Idea would be to build a single number, publish it month over month or quarter over quarter to show some trends on how public transportation related investments or policy changes are working for our city.
It is tempting to try a traffic and transportation index instead. But public transport is the bigger and better defined service that citizens want to consume. Traffic is a different beast, it caters to movement of goods and private as well as public means of mobility.
Unlike for water domain, transportation area may already have with lot of published data points. Further, thanks to a Wilbur Smith report for MoUD (Central Ministry of Urban Development), a lot of thinking too is available to borrow from.