What formula is represented by [Direct hourly volume] divided by [average annual Daily traffic] - [DHV/AADT]?

The formula represented by the ratio of Direct Hourly Volume (DHV) divided by Average Annual Daily Traffic (AADT) is indeed related to the K factor, which is a crucial concept in traffic engineering.

The K factor is used to determine the proportion of daily traffic that occurs during the peak hour. Specifically, it provides insight into how traffic patterns fluctuate over a day, highlighting the peak volume compared to the total daily traffic volume. The K factor is calculated by taking the maximum expected traffic volume in a single hour (the DHV) and dividing it by the total traffic volume expected on average throughout the day (the AADT). This calculation is fundamental in roadway design, traffic management, and understanding peak traffic conditions for infrastructure planning.

Understanding the K factor is essential for civil engineers as it assists in predicting congestion, ensuring adequate roadway capacity, and designing appropriate traffic control measures. This formula helps address peak hour traffic scenarios, ensuring that civil engineers can effectively accommodate traffic demands in roadway and intersection designs.