Traffic Volume Figure 19 and Table 24 summarize crashes by average annual daily traffic, or AADT, for all modes, compared to the percentage of the total lane mileage within each AADT range. Only crashes that occurred on segments with available AADT data were included in this comparison. Roadways with an AADT of over 40,000 had the largest share of overall crashes (44%) and KSI crashes (40.1%), more than four times higher than their share of the roadway lane miles. Roadways with AADT less than 5,000, despite representing over 70% of roadway lane miles, experienced just over 20% of all crashes and about 15% of KSI crashes, resulting in lower crashes per lane mile. Roads with an AADT over 5,000 are overrepresented in both all crashes and KSI crashes when compared to their share of lane miles. They are also more likely to result in severe outcomes, as indicated by a higher share of KSI crashes.
Percentage of Crashes across all modes by AADT Compared to Percentage of Roadway Lane Miles
57%
60%
50%
44.0%
40.1%
40%
30%
20.0%
17.0%
20%
13.7%
13.1%
11.9%
7.4% 13%
9%
9.9%
9%
8.6%
7.5%
6.9%
10%
4%
9%
0%
0-1,000 1,000-5,000 5,000-10,000 10,000-20,000 20,000-40,000 >=40,000
% of All Crashes
% of KSI Crashes
% of Roadway Miles
Figure 19: Percentage of Crashes across all modes by AADT, 2019-2023
Table 24: Crashes across all modes by AADT, 2019-2023 Traffic Volume (AADT) # of Crashes % of Crashes
# of KSI Crashes
% of KSI Crashes
% of Miles
0-1,000
5,348
13.7%
128
7.5%
57.4%
1,000-5,000
2,708
6.9%
126
7.4%
12.7%
5,000-10,000
3,855
9.9%
223
13.1%
8.6%
32
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