What is the crash rate for 18 crashes on a 3.2-mile two-lane road with an AADT of 13,000 vehicles per day?

To determine the crash rate, you can use the formula for crashes per 100 million vehicle miles, which is calculated by the following steps:

1. Calculate the total vehicle miles traveled (VMT): This is done by multiplying the average annual daily traffic (AADT) by the number of days in a year (typically 365) and the length of the road in miles. In this case, the AADT is 13,000 vehicles per day, the road length is 3.2 miles, and thus the calculation is:

[

\text{VMT} = 13,000 , \text{vehicles/day} \times 365 , \text{days/year} \times 3.2 , \text{miles}

]

[

\text{VMT} = 13,000 \times 365 \times 3.2 \approx 15,169,600 , \text{vehicle miles/year}

]

2. Convert the total vehicle miles to millions:

[

\text{VMT in millions} = 15,169,600 \div 1,000,000 \approx