General Design Principles

This section describes the fundamental design principles common among all categories of roundabouts. Guidelines for the design of each geometric element are provided in the following section. Further guidelines specific to double-lane roundabouts, rural roundabouts, and mini-roundabouts are given in subsequent sections. Note that double-lane roundabout design is significantly different from single-lane roundabout design, and many of the techniques used in single-lane roundabout design do not directly transfer to double-lane design.