Divyakant Tahlyan MOBILITY TRENDS AND COVID-19 IN THE Hani Mahmassani CITY OF CHICAGO: APRIL 29, 2020 Northwestern University Transportation Center
MAIN TAKEAWAYS 1. Number of vehicle crashes in Chicago continues to be slowly ticking back up after its low in the wek of March 22-28, but remains about 50% below the levels of the pre-shelter in place order. 2. Crash severity in relative frequency terms continues to be above its pre-lockdown level, though appears to be gradually decreasing from peak reached in week of March 29-April 4– but not the percentage of fatal crashes, which is higher in the past two weeks than the week of March 29-April 4. 3. Crashes involving pedestrians continue a decreasing trend since the lockdown, though the percentage of fatalities is higher post-lockdown.
CRASHES IN THE CITY OF CHICAGO 2019 VERSUS 2020 Looks like the number of daily crashes are on a slight upward trend over the last 2- 3 weeks
Number of Crashes per Week WEEKLY NUMBER OF CRASHES 2500 2048 2053 MARCH 1 TO APRIL 25, 2020 2000 Number of Crashes 1500 1330 1016 985 905 876 1000 824 500 0 M M M M M A A A p p p a a a a a r r r r r r r r 1 8 1 2 2 5 1 1 2 9 5 2 9 - - - - - A M M - - - p A A M M A a a r p p p r r a a r r 1 r 7 1 r r 4 1 1 2 4 2 2 8 5 1 8 Time Period 2-Week Rolling Average 2500 2050.5 2000 Number of Crashes 1691.5 1500 1077 1000.5 930.5 890.5 864.5 1000 500 0 M M M M M A A p p a a a a a r r r r r r r 1 8 1 2 2 5 1 2 5 2 9 - - - - A M M - - - p A M A A a a r p p p r r a r 1 r r 1 2 r 4 1 8 2 4 1 2 5 1 8 This is an animation, see in Weekly snapshots in next slide Time Period presentation mode
100.00 86.80 85.64 84.90 84.59 84.74 CRASHES BY 90.00 83.61 83.25 83.31 SEVERITY 80.00 TYPE 70.00 60.00 Percentage 50.00 40.00 30.00 20.00 9.10 9.06 8.50 8.51 7.55 7.41 6.88 6.51 5.82 5.18 10.00 4.92 4.44 4.37 4.42 3.84 3.15 2.65 2.11 2.18 2.17 2.03 1.66 1.75 1.77 0.41 0.12 0.22 0.23 0.30 0.05 0.05 0.00 0.00 'NO INDICATION OF INJURY' 'REPORTED, NOT EVIDENT' 'NONINCAPACITATING 'INCAPACITATING INJURY' FATAL' INJURY' Injury Severity Mar 1 - Mar 7 Mar 8 - Mar 14 Mar 15 - Mar 21 Mar 22 - Mar 28 Mar 29 - Apr 4 Apr 5 - Apr 11 Apr 12 - Apr 18 Apr 19 - Apr 25
PEDESTRIAN CRASHES
Number of Pedestrain involved Crashes PEDESTRAIN 70 62 60 48 Number of Crashes CRASHES PER 50 37 40 34 27 30 25 WEEK 24 20 14 10 0 M M M M M A A A p p p a a a a a r r r r r r r r 5 1 1 1 8 1 2 2 2 9 5 2 9 - - - - - A M M - - - M M A p A A a a r p p r r a a p 1 r r r r r 7 1 1 1 2 4 4 2 2 8 5 1 8 Time Period 2 Week Rolling Average 60 55 50 42.5 Number of Crashes 40 31 30.5 29.5 30 20.5 19 20 10 0 M M M M M A A p p a a a a a r r r r r r r 5 1 1 8 1 2 2 2 5 2 9 - - - - M M - - - A p A M A A a a r p p p r r a r 1 r r r 1 2 8 2 4 1 4 1 2 5 1 8 Time Period
PEDESTRAIN 80.00 CRASHES’ 66.67 70.00 64.29 60.00 SEVERITY 56.76 60.00 52.08 46.77 50.00 Percentage 38.24 40.00 32.35 29.63 29.63 25.93 30.00 24.19 21.43 20.00 18.75 18.75 18.92 17.65 20.00 14.52 14.52 13.51 12.50 11.11 10.81 10.42 8.82 8.33 8.33 8.00 8.00 7.14 7.14 10.00 4.17 4.00 3.70 2.94 0.00 0.00 0.00 0.00 0.00 'NO INDICATION OF INJURY' 'REPORTED, NOT EVIDENT' 'NONINCAPACITATING INJURY' 'INCAPACITATING INJURY' FATAL' Injury Severity Mar 1 - Mar 7 Mar 8 - Mar 14 Mar 15 - Mar 21 Mar 22 - Mar 28 Mar 29 - Apr 4 Apr 5 - Apr 11 Apr 12 - Apr 18 Apr 19 - Apr 25
AVAILABLE DATA FROM THE CITY OF CHICAGO Crash Data: https://data.cityofchicago.org/Transportation/Traffic-Crashes-Crashes/85ca-t3if (Updated Regularly) Chicago Congestion Estimates: https://data.cityofchicago.org/Transportation/Chicago-Traffic-Tracker-Congestion-Estimates- by-Se/n4j6-wkkf (Uses CTA GPS data to estimated link speeds on city network every couple seconds/minutes, updated regularly) Red Light traffic violations: https://data.cityofchicago.org/Transportation/Red-Light-Camera-Violations/spqx-js37 (last updated March 24) Speed Camera Violations: https://data.cityofchicago.org/Transportation/Speed-Camera-Violations/hhkd-xvj4 (last updated March 24) Chicago Taxi Data: https://data.cityofchicago.org/Transportation/Taxi-Trips/wrvz-psew (last updated Dec 31, 2019) Chicago Divvy Bikes data: https://divvy-tripdata.s3.amazonaws.com/index.html (last updated Dec 31 2020) L Entry data: https://data.cityofchicago.org/Transportation/CTA-Ridership-L-Station-Entries-Daily-Totals/5neh-572f (last updated Dec 31, 2019) CTA ridership info: https://data.cityofchicago.org/Transportation/CTA-List-of-CTA-Datasets/pnau-cf66 (last update Dec 31, 2019) Note: Data in red is where updated information is available for the month of March/April
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