There is increasing interest in the modern roundabout as an intersection design form. Entry and circulating speeds are controlled by the geometric features of the roundabout, including the size of the central island and outer diameter of the circulating roadway, entry and exit radii and the length and shape of splitter islands. All vehicles enter the roundabout under yield control, minimizing intersection delay. Right-angle and left-turn crashes are essentially eliminated, reducing the average severity of intersection crashes. But these safety and efficiency advantages may not be realized if the roundabout is not properly designed or if traffic control devices are not properly applied.
The workshop emphasizes criteria for selection of roundabouts as an intersection form, geometric design practices and procedures and design of traffic control devices.
