What is the formula for calculating the crash rate at intersections?

The formula for calculating the crash rate at intersections is based on the number of crashes (A), the exposure time (T), the volume of traffic (V), and commonly factors such as a million or some constant that helps standardize the rate.

In this context, the correct formula involves multiplying the number of crashes by 10^6 to scale this figure appropriately. The exposure time, typically noted in days, is scaled to represent an annual figure, and the volume (V) is an indicator of the traffic flow, which significantly affects the likelihood of crashes at intersections. The denominator consists of the annualized exposure (365 days multiplied by T), as well as the traffic volume (V), ensuring that the crash rate provides a meaningful figure reflecting crashes per million vehicles per year.

By using the specific multiplication factor of 10^6 in conjunction with the time and volume, this formula effectively represents the crash rate on a per-million-vehicle basis annually, facilitating comparisons across different locations and timeframes.