What equation is used to calculate the intersection accident rate, R?

• A. Eq. 4-2
• B. Eq. 18-2
• C. Eq. 24-9
• D. Eq. 22-6

Answer: (A)

The equation used to calculate the intersection accident rate, R, is typically derived from empirical data relating to traffic volumes and accident frequencies at intersections. The rate is expressed as the number of accidents per million entering vehicles or similar units, allowing for standardized comparisons across various intersections.

The specific reference to Eq. 4-2 suggests it embodies the foundational formula relevant to this calculation, possibly incorporating aspects such as traffic volume, accident history, and intersection geometry. This foundational equation would be based on substantial research or statistical modeling that relates vehicle interactions at controlled or uncontrolled intersections with their resulting accident statistics.

Other equations mentioned may apply to different scenarios within traffic analysis, such as various roadway conditions, specific types of intersections, or other traffic safety measures, but they do not represent the primary or established formula for intersection accident rates. Thus, Eq. 4-2 stands out as the widely recognized equation to compute R in the context of intersection safety evaluation.