Watch this 7 second video of a person driving a late model Toyota Camry in Lincoln Park at 50 MPH, next to the park. 

mean 30.83 mph
median 31
mode 30
min 17
max 50
frequency: 121 cars
greater than 30 mph: 65 cars
% greater than 30 mph: 53.72%

Statistics exclude the three buses counted at 26, 18, 20. Time was 8:23 to 8:38 on Friday, May 4, 2012, at Clark Street and Menomenee Street. The street width at where I collected the data is 65’9″ (789 inches). This location is eligible for a speed camera as it is within 1/8 mile of a park and is thus a “Children’s Safety Zone”.

I’m still working on the report for an article to be published on Grid Chicago. I used this Bushnell Velocity Speed Gun.

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  • http://pulse.yahoo.com/_G4HAJAVAIBOIM7K5LV6JKW6GAM John

    It would be valuable to show the 85% percentile speed since that’s the standard used by engineers.

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

      What do engineers use the “85th percentile speed standard” for?

      • http://flickr.com/photos/walkingsf Eric Fischer

        For setting speed limits. At least in California, the speed limit on most streets is required to be the 85th percentile measured speed, currently rounded to the nearest 5 miles per hour, formerly rounded up.

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

          I prefer the Chicago method: Everywhere, except highways, is 30 MPH or slower. No one should be driving faster than that in mixed traffic, and Chicago has mixed traffic everywhere.