Imprecisions in widely shared Reuters article on Chicago biking

[flickr]photo:2672705063[/flickr]

People ride their bikes across the point at which Milwaukee Avenue was measured to have a mode share of 22% bicycles. 

These are important to mention because they will be shared again and again. While nothing was inaccurate, there was definitely space to clarify and expand. Original article.

1. “[Gabe] Klein hopes the percentage of trips taken by bike will rise from under 2 percent to 5 percent”

The percentage of “trips taken by bike” (for any purpose) is not known. We only know the percentage of trips taken by bike to work, and it stands at 1.4% right now.

The goal of the Bike 2015 Plan is to have 5 percent of all trips under 5 miles be by bike. But we won’t know when we achieve that because we lack baseline data: no survey collects the data on trips by bike for all purposes and categorizes them by distance – there was a household travel survey in 2007-2008 from the Chicago Metropolitan Agency for Planning (CMAP), but only for counties and not Chicago. I have written many times before about the “missing data” and baseline data problem: One, two, three, four.

Continue reading Imprecisions in widely shared Reuters article on Chicago biking