Transportation & Mobility


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Modern roundabouts are the safest traffic control device available and are used throughout the world. Their use is increasing in the United States because they provide a safer environment (especially for pedestrians and bicyclists), increase intersection capacity and calm traffic. A roundabout is a small circular island in the middle of an intersection around which all vehicles must travel. Roundabouts are dissimilar to the old-style traffic circles or rotaries. Contrary to the high-speed entry to most traffic circles, modern roundabouts require entering drivers to slow down and then yield to circulating traffic.

There are many benefits to using a roundabout as a traffic control device. Roundabouts reduce crashes by 50 to 90% by:

  • slowing vehicles down,
  • reducing the number of decisions drivers have to make, and
  • reducing the number of conflict points

Pedestrians and bicyclists find intersections controlled by roundabouts easier to navigate because:

  • vehicles are moving more slowly,
  • left-turns for bicyclists are simplified,
  • traffic can be crossed one direction at a time, and
  • the splitter island acts as a refuge where they can stop and wait for a break in traffic

Roundabouts also provide many other functional and aesthetic benefits. They:

  • increase intersection capacity,
  • reduce electricity and maintenance costs,
  • can be landscaped using a wide range of treatments such as fountains, flower gardens or statues, and
  • act as a gateway into a community or as a focal point.

Genesis' talented team of Transportation Engineers and Landscape Architects provides the following services related to roundabouts:

  • Training courses
  • Conceptual design
  • Detailed design
  • Streetscape/landscape design
  • Traffic calming scheme design
  • Public participation coordination
  • Alternate road network design

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