What equation in the AASHTO Green Book provides information on SSD related to horizontal curves?

• A. Eq. 3-26
• B. Eq. 3-18
• C. Eq. 3-37
• D. Eq. 3-11

Answer: (C)

The equation in the AASHTO Green Book that provides information pertaining to the sight distance (SSD) related to horizontal curves is indeed designated as Eq. 3-37. This equation addresses the factors involved in determining the necessary sight distance on horizontal curves, specifically focusing on how to calculate the minimum stopping sight distance required for the safety of vehicles negotiating a curve.

It takes into account elements such as the radius of the curve, the speed of the vehicles, and the driver's perception-reaction time, all of which are crucial for ensuring that drivers can see and respond appropriately to potential hazards. Understanding this equation is vital for roadway design, as it ensures that sufficient visibility is maintained on curves, thereby enhancing safety for all road users.