Public Works

Roundabouts 

Roundabout Projects

Kirkwood Blvd SW
Intersection and pedestrian improvements are planned to help support traffic flow for the College Community School District. A roundabout is proposed at the intersection of Kirkwood Blvd and the district's south access Map depicting location of roundabout on Kirkwood Blvd., south of 76th Ave SWroad, south of 76th Avenue SW. 

Project Goals

  • Improve safety conditions
  • Reduce traffic speeds
  • Improve traffic flow/efficiency
  • Support future growth of district 

Project Timeline

  • Project bid: Spring 2017
  • Construction: Summer 2017 (avoiding school year)
Funding & Cost

  • Iowa DOT Traffic Safety Improvement Program (TSIP) Grant
  • Tax increment financing (TIF) District Funding
  • Roundabout = $1M
  • Total project cost (roundabout, landscaping, acquisition, design, environmental) = $2M
Renderings / Copy of Public Meeting Presentation

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What is a Roundabout?

A modern roundabout is an unsignalized, circular intersection engineered to maximize safety and minimize traffic delay. Fundamental characteristics of all roundabouts include:

  • Counterclockwise Flow. Traffic travels counterclockwise around a center island
  • Entry Yield Control. Vehicles entering the roundabout yield to traffic already circulating.
  • Low Speed. Curvature that results in lower vehicle speeds, generally 15-25 MPH, throughout the roundabout

(video courtesy of Insurance Institute for Highway Safety)

Benefits of Roundabouts

SAFETY

  • Eliminates head-on crashes and right-angle crashes
  • Decreases severity of crashes
  • Reduces speeds 

TRAFFIC FLOW

  • Can move more traffic during peak hours
  • Reduces stops
  • Reduces delays
  • Reduces congestion 

ENVIRONMENT & COMMUNITY LIVABILITY

  • Reduced emissions
  • Reduced fuel waste
  • Fewer hard stops
  • Landscaping and beautification / neighborhood aesthetics 

ECONOMICAL

  • Longer service life
  • No signal maintenance 
  • Better long-term economic value

Resources on Roundabouts

Rendering and instruction on navigating a roundabout

Sources: Iowa Department of Transportation, Federal Highway Administration

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