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Roundabout Benefits
crash reduction chart
Roundabouts are increasingly popular because, at appropriate locations, they offer many benefits over intersections controlled by traffic signals or stop signs.

OPERATIONS:
• Accommodates higher traffic volumes than traffic signals with fewer approach lanes
• Reduces delay during off-peak times; no waiting at red lights
• Reduces delay on side-street approaches
• Can improve travel times along a corridor
• Effectively handles heavy left-turning traffic
• Accommodates u-turns for cars and large trucks
• Can provide better access to businesses because of easier u-turns

DESIGN:
• Provides more landscaping opportunities
• Typically provides overall cost savings
• Allows for large vehicle passage via the “truck apron”
• Promotes slower speeds through intersection
• Provides improved visibility and refuge for pedestrians crossing the roadway

MAINTENANCE:
• Snow removal can be handled by regular maintenance forces
• No traffic signal maintenance costs, electrical costs, or repair needs
• No traffic impacts due to power outages

ENVIRONMENT:
• Increases fuel savings due to less delay and stopping
• Reduces vehicle emissions due to reduced need for stopping
• Reduces construction area on approaches that can save trees
• Reduces stormwater run-off due to reduced pavement area on approaches

SAFETY:
• Reduces vehicle crashes, particularly injury crashes (see below)
• Lowers vehicle speeds
• Fewer driver decisions; traffic only comes from one direction when entering
• Fewer conflict points
• Reduces conflict severity; no right-angle or head-on conflicts
• Safer pedestrian crossings due to reduced distances, lower speeds, better visibility