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Florida Workshop on Roundabouts
            August 18, 2009 – Maitland, FL


   Roundabouts: Implementation in the US


Ma...
State of the Union?
Progress in building roundabouts
            WA                    MT             ND                                      ...
How can we assess the progress?
 Number of modern roundabouts built
 Number of roundabout projects in design
   or planned...
Number of modern roundabouts built

Constantly changing
Differences among State DOT, local
   agencies and developers
“Pro...
Number of modern roundabouts built

The Centenarians      Definitely AARP
 (over 100) Club          Eligible
In Several States the Locals are
      “Leading the Way”
Carmel, Indiana (pop 85,000)
–    Installed first 2 roundabouts i...
State DOT Design Guidelines
Roundabout Policies
Wisconsin DOT Intersection Control Evaluation Policy:
  “If an intersection warrants a signal or a fou...
Roundabout Policies
Virginia DOT Policy:
  “VDOT recognizes that Roundabouts are frequently able to
  address safety and o...
Roundabout Policies
Georgia DOT Policy:
  “The Georgia Department of Transportation (GDOT) recognizes that the
  roundabou...
FHWA Memo
Consideration and Implementation of Proven Safety
        Countermeasures; July 10, 2008
                       ...
So, why aren’t more agencies
    building roundabouts?
Pick Your Favorite Excuse
 “The public will lynch us if
we propose a roundabout.”
 “I know how people drive in
my town – t...
FACT: Roundabouts are often confused with
other types of circular intersections




                   ≠
Myth: The public will never accept roundabouts




     Sometimes it takes perseverance!!!
Photo source: NYSDOT
Getting Used to
         Roundabouts
Washington State DOT engineer Brian Walsh:

“we have had a lot of people not very hap...
FACT: Public Attitude Toward Roundabouts Quickly
           Changes After Their Construction


Attitude              Befor...
Drivers Who Favor or Oppose
            Roundabouts
                    70
                    60            63
          ...
From Opposition To Support




ITE Journal Sept 2002: Surveys in Kansas, Maryland and Nevada
Opponents Can Become
       Proponents
Letter to the Editor:
“I must admit it! I was wrong. The roundabout at
Marsh and Ha...
Cost Considerations
Actual cost will depend on project specific conditions
– Most agencies find the initial construction c...
Benefit Considerations
Safety Benefits
– savings due to substantial reduction in fatal and injury crashes

Operational Ben...
Myth: Roundabouts are bad for
    the nearby businesses

Fact: Most business owners agree that
 slower speeds and safer tr...
Case Study: Golden, Colorado




                   South Golden Road
AFTER
Case Study: Golden, CO
  South Golden Road – 15,000 ADT
$1.3M project in 1999 to construct four
roundabouts, landscaping, ...
Where are roundabouts
               appropriate?
 Roundabouts should be considered under a wide range
   of conditions, b...
Roundabouts should be considered under a wide range
  of conditions, but may be particularly advantageous at:
Replacement ...
Roundabouts should be considered under a wide range
  of conditions, but may be particularly advantageous at:

Intersectio...
Roundabouts should be considered under a wide range
  of conditions, but may be particularly advantageous at:

Rural inter...
Roundabouts should be considered under a wide range
  of conditions, but may be particularly advantageous at:

  Freeway i...
Roundabouts should be considered under a wide range
    of conditions, but may be particularly advantageous at:

Intersect...
Roundabouts should be considered under a wide range
  of conditions, but may be particularly advantageous at:


3-leg inte...
Roundabouts should be considered under a wide range
  of conditions, but may be particularly advantageous at:

Closely spa...
Roundabouts should be considered under a wide range
  of conditions, but may be particularly advantageous at:

 Transition...
Roundabout Landscaping




“Musica” at the Music Row Roundabout – Nashville, TN
Keeping up with the Jones’
Principles for Good Roundabout
           Landscaping
Make the center island more
conspicuous
Minimize roadside hazards
Ma...
New FHWA sponsored roundabout
          tools and resources
•   Color brochure: Roundabouts: A Safer Choice – currently av...
For more information ….
 Contact:
 Mark Doctor
 FHWA Resource Center
 (404) 562-3732
 mark.doctor@dot.gov
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FWHA Roundabout Presentation 8 18 2009

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Mark Doctor, Federal Highway Administration PE presents an overview of Roundabout Implementation in the USA.

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Transcript of "FWHA Roundabout Presentation 8 18 2009"

  1. 1. Florida Workshop on Roundabouts August 18, 2009 – Maitland, FL Roundabouts: Implementation in the US Mark Doctor, PE FHWA Resource Center
  2. 2. State of the Union?
  3. 3. Progress in building roundabouts WA MT ND NH VT MN ME SD WI OR ID WY NY MI IA MA NE PA IL IN OH NJ RI NV UT CO CT KS MO WV DE KY VA CA MD OK TN NC DC AZ NM AR SC MS AL LA GA TX AK FL Substantial Moderate Infancy HI Disclaimer: This is a highly subjective assessment solely representing the opinion of the presentation author based on information related to multiple factors. If you have data to suggest revising this assessment, please contact Mark Doctor at FHWA (mark.doctor@dot.gov)
  4. 4. How can we assess the progress? Number of modern roundabouts built Number of roundabout projects in design or planned State design guidelines Agency policy on roundabouts Roundabout web page, video, brochure Roundabouts in States Driver’s Manual Statewide Roundabout Steering Group
  5. 5. Number of modern roundabouts built Constantly changing Differences among State DOT, local agencies and developers “Prorate” considerations? – Per capita – Per system miles – % of intersections on network
  6. 6. Number of modern roundabouts built The Centenarians Definitely AARP (over 100) Club Eligible
  7. 7. In Several States the Locals are “Leading the Way” Carmel, Indiana (pop 85,000) – Installed first 2 roundabouts in 1998 – Now has over 40 roundabouts in place – 99 roundabouts in suburban Indianapolis – Indiana DOT: 1 roundabout on State system (6 more planned over next 3 years)
  8. 8. State DOT Design Guidelines
  9. 9. Roundabout Policies Wisconsin DOT Intersection Control Evaluation Policy: “If an intersection warrants a signal or a four-way stop within the design life of the proposed project, the modern roundabout shall be evaluated as an equal alternative.” “… the roundabout may be a viable alternative for a two-way stop control in certain circumstances.” “… roundabouts are a potential intersection control strategy until such time that the evaluation indicates that the roundabout alternative is not appropriate.” Source: Wisconsin DOT Facilities Development Manual
  10. 10. Roundabout Policies Virginia DOT Policy: “VDOT recognizes that Roundabouts are frequently able to address safety and operational objectives better than other types of intersections. Therefore, it is VDOT policy that Roundabouts be considered when a project includes reconstructing or constructing new intersections, signalized or unsignalized.” “When the analysis shows that a Roundabout is a feasible alternative, it should be considered the Department’s preferred alternative due to the proven substantial safety and operational benefits.”
  11. 11. Roundabout Policies Georgia DOT Policy: “The Georgia Department of Transportation (GDOT) recognizes that the roundabout is a viable intersection alternative when placed in the appropriate location, and designed properly for the local conditions. Guidance Statement/Application Roundabouts are the preferred safety and operational alternative for a wide range of intersections of public roads. A roundabout shall be considered as an alternative in the following instances: – Any intersection in a project that is being designed as new or is being reconstructed. – All existing intersections that have been identified as needing major safety or operational improvements. – All signal requests at intersections (provide justification in the Traffic Engineering Study if a roundabout is not selected).”
  12. 12. FHWA Memo Consideration and Implementation of Proven Safety Countermeasures; July 10, 2008 GUIDANCE STATEMENT: Roundabouts are the preferred safety alternative for a wide range of intersections. Although they may not be appropriate in all circumstances, they should be considered as an alternative for all proposed new intersections on Federally-funded highway projects, particularly those with major road volumes less than 90 percent of the total entering volume. Roundabouts should also be considered for all existing intersections that have been identified as needing major safety or operational improvements. This would include freeway interchange ramp terminals and rural intersections.
  13. 13. So, why aren’t more agencies building roundabouts?
  14. 14. Pick Your Favorite Excuse “The public will lynch us if we propose a roundabout.” “I know how people drive in my town – they’ll never get used to a roundabout.” “We’ll get sued because of all the crashes it will cause.” It will cost more than a signal.
  15. 15. FACT: Roundabouts are often confused with other types of circular intersections ≠
  16. 16. Myth: The public will never accept roundabouts Sometimes it takes perseverance!!! Photo source: NYSDOT
  17. 17. Getting Used to Roundabouts Washington State DOT engineer Brian Walsh: “we have had a lot of people not very happy about the idea of roundabouts, but after they are constructed, those fears mostly go away.”
  18. 18. FACT: Public Attitude Toward Roundabouts Quickly Changes After Their Construction Attitude Before After Construction Construction Very Negative 23% 00% Negative 45% 00% Neutral 18% 27% Positive 14% 41% Very Positive 0% 32% NCHRP Synthesis 264
  19. 19. Drivers Who Favor or Oppose Roundabouts 70 60 63 50 PERCENT 40 41 30 31 20 10 15 0 Before After Before After FAVOR STRONGLY Insurance Institute for Highway Safety OPPOSE
  20. 20. From Opposition To Support ITE Journal Sept 2002: Surveys in Kansas, Maryland and Nevada
  21. 21. Opponents Can Become Proponents Letter to the Editor: “I must admit it! I was wrong. The roundabout at Marsh and Hamilton roads appears to be working. Congrats to the Ingham County Road Commission and to Meridian Township” Okemos, MI
  22. 22. Cost Considerations Actual cost will depend on project specific conditions – Most agencies find the initial construction cost of a roundabout is comparable to the initial construction cost of a signal A “life-cycle” cost comparison should be used since roundabouts do not require signal equipment maintenance ($15,000 + per year) – Considering operational and maintenance costs, roundabouts are often less expensive than signals due to reduced costs for signal power, bulb replacement, loop detection and controller equipment maintenance (including need to retime signals) Typically, a roundabout requires fewer turn lanes and possibly fewer through lanes than needed at a signalized intersection, so in some instances a roundabout may actually cost less than a signalized intersection.
  23. 23. Benefit Considerations Safety Benefits – savings due to substantial reduction in fatal and injury crashes Operational Benefits – consider reduction in person-hours of delay and reduced commercial vehicle delay throughout the day (not just peak hours) Environmental Benefits – reduced fuel consumption & improved air quality – enhanced aesthetic opportunities
  24. 24. Myth: Roundabouts are bad for the nearby businesses Fact: Most business owners agree that slower speeds and safer travel enhance business along the corridor Fact: Some “blighted” communities have actually experienced economic revitalization following roundabout projects
  25. 25. Case Study: Golden, Colorado South Golden Road
  26. 26. AFTER
  27. 27. Case Study: Golden, CO South Golden Road – 15,000 ADT $1.3M project in 1999 to construct four roundabouts, landscaping, medians & sidewalks Significant drop in number and severity of crashes – 1997 crash rate = 5.9 crashes/MVM – 2004 crash rate = 0.2 crashes/MVM Slower speeds but faster travel time thru corridor 60% sales tax revenue increase along corridor – Roundabouts are good for business !!!
  28. 28. Where are roundabouts appropriate? Roundabouts should be considered under a wide range of conditions, but may be particularly advantageous at: Intersections with a high-crash rate or a higher severity of crashes Roundabouts can greatly improve safety by simplifying traffic movements, reducing vehicle speeds, and providing a clearer indication of the driver’s right of way compared to other forms of intersection control.
  29. 29. Roundabouts should be considered under a wide range of conditions, but may be particularly advantageous at: Replacement of all-way stops Replacement of signalized intersections, especially where unbalanced movements cause inefficiency Replacement of two-way stops when side street delay becomes excessive Before & After in Asheville, NC College & Oak St.
  30. 30. Roundabouts should be considered under a wide range of conditions, but may be particularly advantageous at: Intersections with complex geometry, skew angles, or more than four approaches Before After Albuquerque, NM – Central Ave. and 8th
  31. 31. Roundabouts should be considered under a wide range of conditions, but may be particularly advantageous at: Rural intersections with high-speed approaches Elongated splitter islands with successive reverse curvature can greatly improve safety at high speed approaches by alerting drivers to a changed traffic condition ahead.
  32. 32. Roundabouts should be considered under a wide range of conditions, but may be particularly advantageous at: Freeway interchange ramp terminals Roundabouts can facilitate truck turning movements and reduce their need for stopping.
  33. 33. Roundabouts should be considered under a wide range of conditions, but may be particularly advantageous at: Intersections with high U-turn movements Roundabouts facilitate the use of raised medians for access management along the roadway by making U-turn movements easier at the intersections. Malta, NY – State Route 67
  34. 34. Roundabouts should be considered under a wide range of conditions, but may be particularly advantageous at: 3-leg intersections with heavy left-turn volumes Example of a design using a through movement bypass-lane
  35. 35. Roundabouts should be considered under a wide range of conditions, but may be particularly advantageous at: Closely spaced intersections with widening constraints Railroad Underpass New London, CT
  36. 36. Roundabouts should be considered under a wide range of conditions, but may be particularly advantageous at: Transitions or “Gateways” from higher speed to lower speed areas Where aesthetics are important Roundabouts make for good transitions in speed change (including rural to urban transitions).
  37. 37. Roundabout Landscaping “Musica” at the Music Row Roundabout – Nashville, TN
  38. 38. Keeping up with the Jones’
  39. 39. Principles for Good Roundabout Landscaping Make the center island more conspicuous Minimize roadside hazards Maintain adequate sight distance Discourage pedestrian traffic through the center island Improve area aesthetics
  40. 40. New FHWA sponsored roundabout tools and resources • Color brochure: Roundabouts: A Safer Choice – currently available • National Highway Institute one-day workshop on roundabouts – currently available • FHWA Technical summary on roundabout design details, costs, safety benefits, etc. – late 2009 • FHWA Technical summary on mini-roundabout design details, costs, safety benefits, etc. – late 2009 • Updated Roundabout Informational Guide including mitigation measures for vision-impaired pedestrians (NCHRP Project 03-65A) – late 2009/early 2010 • DVD on the benefits of roundabouts aimed at decision makers – early 2010 UPDATED • Research studies (NCHRP and others) on roundabout pedestrian safety and treatments for sight-impaired pedestrians – ongoing
  41. 41. For more information …. Contact: Mark Doctor FHWA Resource Center (404) 562-3732 mark.doctor@dot.gov
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