MOBILITY TRENDS AND COVID-19 IN THE CITY OF CHICAGO: APRIL 29, 2020

Divyakant TahlyanHani Mahmassani

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 CHICAGO2019 VERSUS 2020

Looks like the number of daily crashes are on a slight upward trend over the last 2-3 weeks

This is an animation, see in presentation mode

WEEKLY NUMBER OF CRASHESM A RCH 1 TO A PR IL 25 , 2020

Weekly snapshots in next slide

2048 2053

1330

824 905 876985 1016

0

500

1000

1500

2000

2500

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

Num

ber

of C

rash

es

Time Period

Number of Crashes per Week

2050.5

1691.5

1077864.5 890.5 930.5 1000.5

0

500

1000

1500

2000

2500

Mar 1 - Mar 14

Mar 8 - Mar 21

Mar 15 - Mar 28

Mar 22 - Apr 4

Mar 29 - Apr 11

Apr 5 - Apr 18

Apr 12 - Apr 25

Num

ber

of C

rash

es

Time Period

2-Week Rolling Average

CRASHES BY SEVERITY TYPE

85.6

4

5.18 6.

88

1.66

0.05

84.9

0

4.92 7.

55

1.75

0.05

83.6

1

4.44

8.50

2.11

0.00

83.2

5

4.37

9.10

2.18

0.12

83.3

1

4.42

8.51

2.65

0.22

84.5

9

5.82 6.51

2.17

0.23

86.8

0

3.15

7.41

2.03

0.41

84.7

4

3.84

9.06

1.77

0.30

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

'NO INDICATION OF INJURY' 'REPORTED, NOT EVIDENT' 'NONINCAPACITATINGINJURY'

'INCAPACITATING INJURY' FATAL'

Perc

enta

ge

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

PEDESTRAIN CRASHES PER WEEK

62

48

37

25

3427

14

24

0

10

20

30

40

50

60

70

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

Num

ber

of C

rash

es

Time Period

Number of Pedestrain involved Crashes

55

42.5

31 29.5 30.5

20.5 19

0

10

20

30

40

50

60

Mar 1 - Mar 14

Mar 8 - Mar 21

Mar 15 - Mar 28

Mar 22 - Apr 4

Mar 29 - Apr 11

Apr 5 - Apr 18

Apr 12 - Apr 25

Num

ber

of C

rash

es

Time Period

2 Week Rolling Average

PEDESTRAIN CRASHES’ SEVERITY

14.5

2

24.1

9

46.7

7

14.5

2

0.00

18.7

5

18.7

5

52.0

8

10.4

2

0.00

13.5

1

18.9

2

56.7

6

10.8

1

0.00

8.00

8.00

60.0

0

20.0

0

4.00

32.3

5

8.82

38.2

4

17.6

5

2.94

11.1

1

29.6

3

29.6

3

25.9

3

3.70

7.14

7.14

64.2

9

21.4

3

0.00

12.5

0

8.33

66.6

7

8.33

4.17

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

'NO INDICATION OF INJURY' 'REPORTED, NOT EVIDENT' 'NONINCAPACITATING INJURY' 'INCAPACITATING INJURY' FATAL'

Perc

enta

ge

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