Which of the following statements is true regarding crash frequency and AADT?

The statement that crash frequency tends to increase with higher Average Annual Daily Traffic (AADT) but is not linear is accurate. In traffic safety analysis, as the volume of traffic increases, the likelihood of crashes also generally increases. However, this relationship is not strictly linear due to various factors that influence crash occurrences, such as road conditions, driver behavior, and traffic control measures.

Specifically, while higher traffic volumes create more opportunities for collisions, the severity and frequency of those crashes can be influenced by multiple other variables, making the relationship complex. For instance, higher AADT may lead to a higher number of minor crashes in congested conditions, rather than severe crashes, resulting in a non-linear relationship.

Understanding this non-linear dynamic is crucial for effective road safety planning and resource allocation, as it highlights the need for targeted interventions in high-traffic areas, rather than assuming a straightforward increase in crash severity with increased volume.