On March 31st, KC Metro expects to record its 3 billionth boarding.

The agency wants you to help celebrate/commemorate the milestone by:

• Submitting a photo of yourself riding your favorite route. (Time for a family pic on the 27!) The photos will be included in a public gallery.

• Sharing your “carbon footprint.” There’s nothing to calculate; you just pick a shoe and add your initials. I think the point is to illustrate the collective impact of riding transit, but I wanted to see some numbers–or, at least some cuter shoe options.

Also, look out for Metro staff with “3 Billion Served” buttons at Westlake Station (and elsewhere) on the 31st.

Here’s to the next 3 billion!