severity 12 . On the other hand, roadways with speed limits higher than 30 mph, despite representing less than half of roadway lane miles, accounted for more than 80% of total crashes and nearly 90% of KSI crashes. Overall, the data indicates that higher-speed roads are overrepresented in all crashes, with this overrepresentation being even more pronounced in KSI crashes.
Percentage of Crashes across all modes by Speed Limit Compared to Percentage of Roadway Lane Miles
59%
60%
50%
40%
30.8%
27.6%
30%
25.0%
24.6%
18.7%
18.1%
20%
15.2%
15.1%
14.7%
21%
10.3%
7%
10%
13%
0.2%
0%
<=30
35-40
45-50
55-60
>=65
% of All Crashes
% of KSI Crashes
% of Roadway Miles
Figure 15: Percentage of Crashes across all modes by Speed Limit, 2019-2023
Table 20: Crashes across all modes by Speed Limit, 2019-2023
Posted Speed Limit (MPH)
All Crash/ Miles
KSI Crashes/ Mile
% of Roadway Lane Miles
% of Crashes
# of KSI Crashes
% of KSI Crashes
Lane Miles
# of Crashes
<=30
5,893
15.1%
176
10.3%
2.2
0.1
2,737 59%
9,611
24.6%
524
30.8%
10.1
0.6
953
21%
35-40
5,743
14.7%
259
15.2%
9.5
0.4
604
13%
45-50
55-60
10,785
27.6%
426
25.0%
33.2
1.3
325
7%
>=65
7,079
18.1%
319
18.7%
797.1
35.9
9
0.2%
Total
39,111 13
100%
1,704 14
100%
8.5
0.4
4,627 100%
12 FHWA Fact Sheet on the relation between speed and crashes https://safety.fhwa.dot.gov/speedmgt/ref_mats/fhwasa1304/Resources3/08%20- %20The%20Relation%20Between%20Speed%20and%20Crashes.pdf
13 The total is different from 39,165 because 54 segment crashes occurred on road segments without available speed limit data. 14 The total is different from 1,705 because one segment crash occurred on road segments without available speed limit data.
27
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