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12 19 11 Work Session Materials_RoundaboutsMasterpiece on the Mississippi TO: The Honorable Mayor and City Council Members FROM: Michael C. Van Milligen, City Manager SUBJECT: Work Session on Roundabouts DATE: December 14, 2011 Dubuque knerd All-America City hill! 2007 City Engineer Gus Psihoyos is transmitting information for the December 19, 2011 work session on roundabouts. Michael C. Van Milligen MCVM:jh Attachment cc: Barry Lindahl, City Attorney Cindy Steinhauser, Assistant City Manager Gus Psihoyos, City Engineer THE CITY OF Dui Masterpiece on the Mississippi TO Michael C Van Mil ligen, City Manager FROM Gus Psihoyos, City Engineer DATE December 13,2011 SUBJECT December 19, 2011 Roundabout Work Session Dubuque AU- America City 11 1111 2007 DISCUSSION The attached provides information for the Monday, December 19,2011 City Council work session on roundabout concepts and its benefits in lieu of traditional intersection design (signalization) Ourston Roundabout Engineering, Inc of Madison, Wisconsin, will present how roundabouts have shown to relieve traffic congestion, achieve better operations with higher traffic capacity, increase user safety, slow high -speed streets, and better upgrade of freeway -to- street interchanges cc Bob Schiesl,Assistant City Engineer David Ness, PE Bill Schlickman, Traffic Engineering Assistant Dubuque ktrati All- America City 111111 2007 The Modern Roundabout Implementation Plans and Public Outreach Mark Lenters, P.E. Ourston Roundabout Engineering Inc. www.ourston.com e 1 Dubuque All- America City 1 I I I I/ 2007 Outline 1. Background on Roundabouts 2. Roundabout pros and cons 3. Implementation strategy A. Dubuque teal All- America City 1 I I I I/ 2007 Traffic Circle Traffic Calming Dubuque teal All- America City '111' 2007 Old Rotary e 4 i Dubuque tedium 11 11 2007 High Capacity Modern Roundabout — 3 Lanes 6 Dubuque 1111- America city 1111 / 2007 Yield Control Vehicles yield upon entry in a modern roundabout. Dubuque teal All- America City '1111' 2007 Circulatory Roadway No traffic control in the circulatory roadway. Movement is counter - clockwise. s ♦ . •1 8 Dubuque All- America City 11 111 2007 Central Island Central island deflects vehicles from a straight -line path. +` 1 �I 9 Dubuque All- America City 1 I I I I 711117 Study Results Convert signalized intersection to roundabout 48% 60% All crashes Fatal /injury crashes Fatal /injury crashes in urban area 10 Dubuque All- America City 2007 Study Results Convert two -way stop intersection to roundabout 44% 87% 78% 1 -lane 72% 2 -lane All crashes Fatal /injury crashes in rural area Fatal /injury crashes in urban area Dubuque All- America City 1 I I I I/ 2007 Avoidable Collisions • Severe Angle and turning movement collisions are avoidable Dubuque All- America City 1 I I I I/ 2007 Overview of Roundabout Benefits e Dubuque teal All- America City 1 I I I I/ 2007 Examples Elsewhere Dubuque tedium 111' 2007 School Access r Pedestrian crossings must conform to ADA standards. • e Dubuque All- America City 2007 Roundabouts are Good for Business, Colorado Before • Unpleasant travel corridor • Wide Roadway • Numerous unorganized access points • Poor safety performance due to left turns and high speeds (suicide Ian) • Center turn lane (suicide turn lane) • Wide pedestrian crossings (84 feet), difficult to cross without traffic signals Golden, Colorad 17 03 T a All- America City 1 1 1 1 1 Five Roundabout Corridor Replaced Traffic Signals 1997 Widen intersections, not the whole road. A series of roundabouts provides a high- capacity, low -cost alternative to road widening. Roundabouts create capacity just where it is needed, at the intersections, minimizing the total cost of bridge widening, pavement, and right of way. e e Avon, CO Sevin •s in cost) road widenin Dubuque teal All-America City 1 I I I I/ 200 Two decades of planned expansion Photo © 2006 Jackie Shumaker Second interchange for Wal -Mart in 2003 20 Dubuque A11- America city 1 1 1 1 1 / 2007 Revenue 2004 to 2009 Sales Tax Collections for April 400,000 00 - 350.000.00 - 300,000.00 - 250,000 00 - 200.000.00 150,000.00 - 100,000 00 50.000.00 2094 2005 2006 Year 2007 2008 2009 Sustained growth, seven years after the roundabouts were built. 21 N N Dubuque teal All- America City 1 I I I I/ 2007 Dubuque All- America City '1111! 2007 Space for Trucks with an Apron Where trucks are common, a concrete apron may be necessary. Most Common Type of Roundabout Interchange Dubuque All- America City 2007 Pros Cons • Function during power outages • Operate well in corridors • Affords narrower bridges • Safest type of at -grade intersection • Slower speeds • Simplified decision making (look left move right) • High capacity compared to stop control & signals • Turning space for trucks • Aesthetic civic feature • Good for business • Larger footprint • Right -of -way requirements • Usually higher construction costs • Driver adaptation /education • Rail crossings • Coordinated signal networks • Disabled persons • Acceptance and education • (Neutral safety for bicyclists) Dubuque All- America City 1 I I I I/ 2007 Why have a robust implementation plan? • Agencies aren't systematic or robust in their implementation • We should apply the same approach as used in other implementation plans • A new device deserves more than just a policy and design guidelines — it's about the users • Agencies need solidarity among departments and more than one agency champion • Too many agencies are reacting instead of planning 27 Dubuque All- America City 111' 2007 Implementation Strategy • Top -down including councilors • Form a task force or ad -hoc committee • Develop champions from each division and department • Systematic in roll -out — internal then external • Progress should be measured and publicized • Policy, practice and outreach must address all stakeholders and users 28 Dubuque All- America City 1 I I I I/ 2007 Measurable Actions • Formulate an implementation plan with these components: — Policy on use approved at the `top' — Organizational structure and process approved and supported including $ for all aspects of implementation — Champions in each division (manage training and reviews) — Quarterly meetings of Champions — Monitoring of sites — Development of a P.I. toolbox (meeting formats, tools, people) 29 Dubuque All- America City 1 I I I I/ 2007 Area -wide Education Campaigns • Making Pedestrians more assertive... 30