Which table in the AASHTO Green Book details stopping sight distance (SSD)?

• A. Table 3-1
• B. Table 3-14
• C. Table 3-3
• D. Table 3-19

Answer: (A)

The AASHTO Green Book, formally known as the "A Policy on Geometric Design of Highways and Streets," includes important tables that outline critical design parameters for roadway infrastructure. Stopping Sight Distance (SSD) is a vital aspect of road design that ensures vehicles have enough distance to stop safely when encountering obstacles.

Table 3-1 provides essential information regarding stopping sight distance. This table outlines key metrics such as reaction time and deceleration rates, along with the necessary calculations to determine the minimum stopping sight distance based on different design speeds. Understanding this information is critical for designing safe roadways, allowing engineers to calculate how far a vehicle will travel before it can come to a complete stop.

The other tables in the Green Book focus on different aspects of roadway design, such as horizontal and vertical curves, lane width, and cross-section design, but it is Table 3-1 that specifically addresses the parameters related to stopping sight distance, making it the relevant reference for SSD calculations.