Where can you find the adjustment factors for saturation flow rate at signalized intersections?

• A. Manual of Uniform Traffic Control Devices
• B. Highway Capacity Manual
• C. Transportation Research Record
• D. Traffic Engineering Handbook

Answer: (B)

The adjustment factors for saturation flow rate at signalized intersections are found in the Highway Capacity Manual (HCM). The HCM provides detailed methodologies for estimating traffic flow and includes critical factors that account for various conditions affecting saturation flow rates, such as lane width, percentage of heavy vehicles, and the presence of buses and bicycles.

These factors help engineers and planners accurately assess the capacity and performance of signalized intersections, enabling them to make informed decisions regarding traffic management and signal timing. The manual encompasses research-backed data and formulas critical for transportation engineers when analyzing traffic operations and improving intersection efficiency.

Other resources like the Manual of Uniform Traffic Control Devices primarily focus on traffic control devices and signage rather than flow rates, while the Transportation Research Record contains various studies and articles on transportation research but does not serve as a dedicated guide for saturation flow rates. The Traffic Engineering Handbook offers general guidelines and practices but lacks the specific depth found in the Highway Capacity Manual regarding saturation flow adjustments.