[dmurray]

Google almost certainly already could, without even asking the commuters, since they have real time location for so many Android phones. But there's a chicken and egg problem: it's hard to get the data before you're able to offer anything in return.

[mjmasn]

Chicken and egg yes, but he had the recent historical data and a bunch of paid-up users.

I'm just amazed this app was even necessary in a first-world transport system. For all their faults, the UK rail network is pretty good at providing timely information (and as some other comments have mentioned have solid APIs for this stuff). Same with the LTA[1] in Singapore.

[1] https://www.mytransport.sg/content/mytransport/home/dataMall...