Where can different traffic conditions for road widening be found?

• A. AASHTO Green Book
• B. Traffic Control Devices Manual
• C. Highway Capacity Manual
• D. Roadway Design Manual

Answer: (A)

The AASHTO Green Book, officially known as the "A Policy on Geometric Design of Highways and Streets," is a comprehensive resource that covers various aspects of road design, including geometric considerations that are essential for road widening projects. It provides guidelines regarding lane widths, shoulder dimensions, and sight distances, all of which are critical for accommodating different traffic conditions during the widening process.

Understanding these geometric principles is crucial for ensuring that the road segments meet safety standards and perform effectively under various traffic volumes and conditions. The AASHTO Green Book incorporates the necessary design features that would support a roadway's ability to handle increased capacity and accommodate diverse traffic flow characteristics, making it an essential reference for anyone involved in highway design and analysis.

While the other resources mentioned—such as the Traffic Control Devices Manual, the Highway Capacity Manual, and the Roadway Design Manual—provide valuable information relevant to traffic management, capacity analysis, and design practices, they are not as focused specifically on the geometric design aspects needed for effectively widening roads.