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?
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?
About Steven Can Plan
I started this blog in 2007 as the writing assignment for an introductory urban planning class at UIC. It's about cities (mainly Chicago), GIS oftentimes, and transportation (mainly bicycling). Learn more about me, Steven Vance. I also write for Streetsblog Chicago.
Steven Can Plan is hosted on Dreamhost.
Chicago Bike Map App
The Chicago Bike Map app is a bike and street map stored entirely in your iOS device – no data connection required. The map is designed to look much like the City of Chicago's official printed and online bike map. The app works on iPhone, iPod touch, and iPad.
Highly Recommended Bike Products
So far I haven't had a flat with this tire. I've used Continental Gatorskin and Panaracer T-Serv, both of which have had flats (same Chicago streets). The Gatorskin has less tread than both, and wears to a slick surface faster.
So far my longest trip was 40 miles on this saddle. It molds to your butt like Birkenstock sandals mold to your feet. The springs make the bike ride a little more comfortable and more fun (weird, because you bounce up and down on them). It also looks gorgeous. Comes in 3 colors - I got black.
Bells can be quite useful, especially to tell people in front that you're passing them. I like the ding-dong bell the best. It makes a solid DING and then DONG on the spring's return.
Making Maps: A Visual Guide to Map Design for GIS by John Krygier PhD, Denis Wood PhD
If you are going to make a map, whether it be hand drawn or digital, you should really give this book a read. Then read it every time you make a map. It will help make sure your maps are laid out sensibly, in a way that others can easily read, and that it doesn't include fluff or unnecessary data.
Instant City: Life and Death in Karachi by Steve Inskeep
I reviewed this book that the publisher sent to me.