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Where to Use Roundabouts
Appropriate conditions for roundabout installation:
- Locations with high delays
- Locations where traffic signals are not warranted
- Four-way stop intersections
- Intersections with more than four legs
- Intersections with high left-turn flows
- Intersections with unusual geometry
- Intersections with changing traffic patterns
- Locations where storage capacities for signalized intersections are restricted
- Intersections that are important from an urban design or visual point of view
The following conditions require special design attention and hiring an experienced designer:
- Locations where there is insufficient space for an acceptable outside diameter.
- Locations where it would be difficult to provide flat (2% or less) entries into the roundabout.
- Maximum grade greater than 4% around the circle,
- A high number of pedestrians, a high percentage of large trucks, intersection junction at the top or bottom of a grade, and the close proximity of adjacent signals..
The design topics can be used as a checklist when designing roundabouts.