Functional Class Figure 17 and Table 22 break out crashes for all modes by roadway classification 15 , compared to each classification’s percentage of roadway lane miles. Tollway / freeway represented the largest share of total and severe crashes, comprising 44.1% of all crashes and 40.9% of KSI crashes. Less than 18% of all crashes and 16% of KSI crashes occurred on residential and collector roads, despite those representing 60% of the roadway lane miles. This indicates that all crashes, and KSI crashes in particular, are concentrated on higher functional class roadways.
Percentage of Crashes across all modes by Roadway Functional Class Compared to Percentage of Roadway Lane Miles
60%
54%
50%
44.1%
40.9%
40%
30%
20%
15.2%
13.5%
13.1%
11.4% 12.3%
8.6%
10%
7.6%
6.4%
4.9%
4.8%
4.7%
3.9%
9%
2.5%
2.0%
7% 8%
1.6%
0.7% 1.2% 0.5%
6% 6%
4%
4% 2%
0%
Tollway / Freeway
Freeway Ramp
Principal Arterial
Major Arterial
Minor Arterial
Collector Residential Service Road
County Road
Unknown
% of All Crashes
% of KSI Crashes
% of Roadway Miles
Figure 17: Percentage of Crashes across all modes by Roadway Functional Class, 2019-2023
15 Functional classification is a federally-mandated categorization of roadways based on the level of traffic service and degree of access they provide. For specific definitions of each functional class, refer to https://www.nctcog.org/getmedia/c77e7aab-3464-440e-a6de- 336963269498/Functional-Class-Eligibility.pdf
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