The Rushing Hour

Whereas most major urban agglomerations have a morning and evening rush hours, the town of Mumbai has what I like to call to a Rushing Hour. Traffic starts increasing around 9am and just keeps increasing from there, see exhibit A below (click image for high res pic).

Some basic annotations*:

7am-9am: People that take public transportation leave for work (majority of people in Mumbai)

9am - 11:30am: People that get to work in cars leave; richer you are, the later in that window you leave

11:30am - 5pm: People going to lunch "meetings" and returning; people go to lunch as late as 2 or 3pm in Mumbai

5pm - 8pm: Most people with normal jobs/own businesses leaving work

8pm - 11 pm: People heading to dinner or a movie

11pm - 2am: People finally going home (from dinner/movie for most people, from work for me)

Double super secret prize contest is back-, what do all the y-axis labels have common?

* Again caveat, super gross generalizations that don't really apply to many people esp those who are especially wealthy or poor (beyond 1.25 SD away). So why do I write them? What do you care?