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      Schedule, Advanced Highway Capacity, At-Grade Intersection Design, Basic Highway Capacity, Roundabouts Course, Functional Geometric Design, Traffic Signal Design, Traffic Signal Timing, Transit Capacity and Transit Quality of Service
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Roundabouts

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Roundabout Basics

A roundabout is a circular intersection with yield control on all approaches, islands to separate flows of traffic from eachother and pedestrians, and geometric features to slow down traffic.

Why Roundabouts?

Roundabouts have many benefits over stop-controlled and signalized intersections. They have proven safety benefits, often have lower delays, can lead to less traffic, can reduce the need for widening, reduces speeds in and around the roundabout, and as a result can benefit the surrounding community.

Driver Safety

Intersection Type Before Conversion After Conversion to Roundabout
Change in Total Crashes Change in Injury Crashes
All Intersections 35% 76%
Signalized 48% 78%
All-Way-Stop No significant change
2-way Stop 44% 82%

Roundabout Schematic

Pedestrian Safety

Chance of pedestrian death if hit by a motor vehicle:

Pedestrian Safety

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