Data presented shows the number of crashes per 100 million vehicle miles traveled between 2015 - 2019. An example of how this is calculated can be found here.

Sources

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Average Crash Rate by Functional Class
Miles of Highway by Crash Rate

Functional Class

Interstate
Freeways and Expressways
Principal Arterial
Minor Arterial
Major Collector
Minor Collector

Average Daily Traffic

0 - 150000+

Crashes / 100 Million Vehicle Miles Traveled

1,000+
750 - 1,000
500 - 750
250 - 500
100 - 250
0 - 100