Roundabouts

Roundabouts require traffic to circulate counterclockwise around a center island. Unlike Traffic Circles, roundabouts are used on higher volume streets to allocate right-of-way between competing movements.

Good for:

  • Locations with a history of accidents;
  • Intersections where queues need to be minimized
  • Intersections with irregular approach geometry
  • Providing inexpensive-to-operate traffic control as an alternative to a traffic signal
  • Handling a high proportion of U-turns
  • Locations with abundant right-of-way

Advantages:

  • Roundabouts can moderate traffic speeds on an arterial
  • They are generally aesthetically pleasing if well landscaped
  • They enhanced safety compared to traffic signals
  • They can minimize queuing at the approaches to the intersection
  • They are less expensive to operate than traffic signals

Disadvantages:

  • They may be difficult for large vehicles (such as fire trucks) to circumnavigate
  • They must be designed so that the circulating lane does not encroach on the crosswalks
  • They may require the elimination of some on-street parking
  • Landscaping must be maintained, either by the residents or by the municipality

Effectiveness:

Similar Measures:

  • By constructing a small island in a neighborhood intersection and leaving the existing curbs, you have a Traffic Circle

Cost Estimate(s):

  • Varies by materials used and the amount of area covered
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