To find storage lengths for the 50th percentile in traffic engineering, which table would you refer to in the AASHTO Green Book?

• A. Table 9-21
• B. Table 9-22
• C. Table 9-23
• D. Both Table 9-21 and 9-23

Answer: (D)

To determine the storage lengths for the 50th percentile in traffic engineering, it is essential to use the appropriate tables in the AASHTO Green Book that provide guidance on this topic. Tables relevant to storage lengths and their respective percentiles are designed to facilitate accurate traffic analysis and planning.

Both Table 9-21 and Table 9-23 provide pertinent data for finding storage lengths at different conditions, including the 50th percentile values. Table 9-21 specifically presents storage lengths for various turning movements, and Table 9-23 offers adjustments to these lengths, taking into account different factors that may influence storage requirements. By considering both tables together, traffic engineers can effectively assess the necessary storage lengths for the 50th percentile, ensuring comprehensive analysis and appropriate design of traffic facilities.

This integrated approach helps in optimizing the functionality of intersections or roadway sections, ultimately leading to improved traffic flow and reduced congestion. Understanding how to utilize these resources in conjunction with one another is crucial for traffic engineers when addressing storage length requirements.