overview of the northeast u.s. roundabouts peer exchange jeffrey shaw fhwa office of safety
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Overview of the Northeast U.S. Roundabouts Peer Exchange
Jeffrey ShawFHWA Office of Safety
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Purpose of the Event
• Magnitude of the Intersection Crash Problem• Compared to NY, roundabout implementation
has been slow in surrounding States• Important U.S.-based information to share• Recognized benefits of in-person events
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A Partnership Foundation
• Jointly-funded effort between HQ, RC and Division Offices
• Partnered with ConnDOT and ITE Roundabouts Task Force
• Assembled an Event Planning Committee representing key
audience backgrounds:Hillary Isebrands (FHWA RC) Charles Harlow (ConnDOT)Bob Ramirez (FHWA CT) Francisco Lovera (RIDOT)Caroline Trueman (FHWA NJ) Mike Mastaglio (RK&K)Ed Stollof (ITE) Joe Balskus (Tighe & Bond)Andy O’Brien (O’Brien Traffic) Jeff Todd (Traffic Planning & Design, Inc.)
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1½ Days of Roundabouts!
• How far have roundabouts come in New England and the Upper Mid-Atlantic?
• What important lessons have been learned that practitioners should know about?
• What challenges lie ahead?• How can we accelerate the implementation of
roundabouts in our States?
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The…..GOOOOOOOOAL!
SHARE
EDUCATE
NETWORK
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Status of Roundabouts in NEUS
• The 9 Peer Exchange States estimated:– 98 existing roundabouts in operation– 74 in-progress planning/design– Over 100 add’l roundabouts at non-State
intersections
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Notable Lessons Learned
• Importance of Education, Marketing & Outreach• Retrofits of existing circles/rotaries can help
overcome regional legacy of circular intersections• Applying roundabouts at challenging/unusual
intersections can yield great success• Roundabouts are scalable, adaptable and can be
context sensitive and sustainable solutions
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Marketing/Education/Outreach
• Updated FHWA Roundabouts Video & Brochure
• Importance of working with Education and EMS communities
Photo credit to Brian Walsh (WSDOT)
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Example of Circle/Rotary Retrofit
Graphic content credit to Andy Paul (MassDOT HQ)
Joe Frawley (MassDOT D3)
NO APPROACH SPLITTER ISLAND
WIDE CIRCULATORY ROADWAY
NO LANE-USE MARKINGS ON MULTILANE APPROACHES
EXISTING
PROPOSED
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Applied to Challenging Locations
BEFOREPROPOSED
Graphic content credit to Will Britnell (ConnDOT)
ACTUAL
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Capable of High Throughput
Photo content credit to Mike Dugas (NHDOT)
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The Solution is Out There
Graphic content creditto Scott Richie (RTE)
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Context Sensitive Opportunities
Photo content creditto Scott Richie (RTE)
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Adaptability for Local Intersections
Graphic and photo content credit to Rich Balgowan
Hamilton Twp NJ PW
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Roundabouts in the Near-Term
• MassDOT creating roundabout-specific tools/products
• Accessibility of multilane crossings at roundabouts
• Capacity analysis
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Upcoming MassDOT Tools/Products
• Roundabout Planning/Screening Tool– Working with the Central Transportation Planning Staff
(CTPS) from the Boston MPO on the development of a tool to assist designers in when to consider a roundabout versus a signalized intersection
• Local Community Reference Guide– To provide details on the benefits of roundabouts and
relationship to traffic calming and livable street aspects to ensure that a roundabout is considered for the correct reasons
Slide content credit to Neal Boudreau (MassDOT HQ)
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Accessibility Aspects of Roundabouts
• Proposed PROWAG rulemaking targeted for fall 2010 by USDOT
• Issue at multilane roundabouts is one of ACCESSIBILITY not safety
Photo content credit to Scott Windley (USAB)
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Capacity Analysis Techniques
• Growing Number of Software/Model Choices– Gap Theory (SIDRA, SYNCHRO, VISSIM, Paramics)– Empirical (RODEL, ARCADY, NCHRP 572/HCM2010)
• Different model inputs/assumptions can yield different results
• Important to Spend Time Wisely– Rules of Thumb/Lessons Learned– Hourly-based flow check can Save Time
Slide content credit to Howard McCulloch (NYSDOT)
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Early Returns/Preliminary Results
• Quality feedback from over 85 attendees: 4.6/5• Average Knowledge Gained (self-assessed):– from 2.65 (Before) to 3.52 (After)
• Some Resulting Action Items:– Seek out lower-cost implementation opportunities– Immediately distribute copies of the new FHWA DVD– Get a mini roundabout piloted this year– Discuss a multi-State follow-up meeting– Evaluate future regional Roundabout Peer Exchanges
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Thank You!
Jeffrey Shaw, P.E., PTOE, PTPHighway Engineer, Intersection Team
Office of Safety Design(708) 283-3524