Roadway geometry refers to the design and layout of roads, including their alignment, cross-section, and profile. It encompasses elements such as curves, grades, and lanes, which are essential for ensuring safe and efficient vehicle movement. Proper roadway geometry helps to minimize accidents and improve traffic flow. Key components of roadway geometry include horizontal alignment, which deals with the curvature of the road, and vertical alignment, which addresses changes in elevation. Additionally, the cross-section of a road includes features like shoulders and medians, which contribute to overall safety and functionality.