Crashes by bike or by foot at different intersections

By On January 16, 2012 · 5 Comments

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While working on a private web application that I call Chicago Crash Browser, I added some code to show the share of pedestrian and pedalcyclist crashes. The site offers users (sorry I don’t have a web server that can make it public) a list of the “Top 10″ intersections in terms of bike crash frequency (that’s bike+auto crash). You can click on the intersection and a list will populate showing all the pedestrian and pedalcyclist crashes there, sorted by date. At the bottom of the list is a simple sentence that tells what percentage pedestrian and pedalcyclists made up at that intersection.

I’m still developing ideas on how this information may be useful, and what it’s saying about the intersection or the people using it.

Let me tell you about a few:

Milwaukee Avenue and Ogden Avenue

I mentioned in my article Initial intersection crash analysis for Milwaukee Avenue that this intersection is the most bike crash-frequent.

23 crashes within 150 feet of the center, 2005-2010

82.61% bike crashes **

17.39% ped crashes.

Ashland Avenue and Division Street

28 crashes within 150 feet of the center, 2005-2010

46.43% bike crashes

53.57% ped crashes **

Milwaukee, North and Damen Avenues

46 crashes within 150 feet of the center, 2005-2010

39.13% bike crashes

60.87% ped crashes **

Halsted Street, Lincoln and Fullerton Avenues

38 crashes within 150 feet of the center, 2005-2010

42.11% bike crashes

57.89% ped crashes **

Montrose Avenue and Marine Drive (Lake Shore Drive ramps)

11 crashes within 150 feet of the center, 2005-2010

90.91% bike crashes **

9.09% ped crashes

Why do you think some intersections have more of one kind of crash than the other?

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People walking at Milwaukee-North-Damen.

The Chicago Crash Browser can be made public if I have a host that offers the PostgreSQL database. Do you have one to offer?

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  • LakeviewJ

    Anecdotally, I’d say that the reason for the disparity at the Montrose/LSD intersection is that there are, within a few blocks, other underpasses that pedestrians prefer.

    In regards to Lincoln/Fullerton/Halsted, I think that the pedestrians from DePaul and CMH frequenting the bars and restaurants in the area are more likely to be involved in an incident. 

    • http://www.stevevance.net/ Steven Vance

      I didn’t know that about Montrose/LSD. 

      I expected that for Lincoln/Fullerton/Halsted. There are tons of people cycling and walking, but just seems to be a few more people walking. Also, lots of people crossing against the crosswalk signal and the awkward six-way intersection. 

      I wasn’t expecting Milwaukee/Ogden to be so disparate. But maybe the pedestrian crashes occur at Milwaukee/Chicago because of the bus stops there and the entrances to the L subway. 

      These are the Top 10 bike crash intersections, but not the Top 10 pedestrian crash intersections. I wonder what the reverse analysis would look like. 

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