There are an infinite number of ways to get from point A to point B. Geometric design is the aspect of transportation engineering that deals with selecting the best path between those points. A good geometric design will balance operational efficiency, comfort, safety, convenience, cost, environmental impact, and aesthetics. 

Geometric Design can be a difficult process, and many professionals rely on the assistance of design manuals. The American Association of State Highway and Transportation Officials has published a design manual entitled: A Policy on Geometric Design of Highways and Streets, which provides engineers with a guide to geometric design that is based on years of practical experience and research.  

This chapter is designed to help the undergraduate engineer in his/her studies of the more quantifiable aspects of geometric design. Our focus here is on the geometric aspect, or the actual shape of the roadway. To begin exploring Geometric Design, click on one of the links to the left.