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Case Study:Mini-Roundabout in anUrban SettingDept. of Public WorksHarford County Gov’t, Maryland
Case Study:Mini-Roundabout in anUrban SettingDept. of Public WorksHarford County Gov’t, Maryland
Jeff StratmeyerChief Engineer
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Just what is a mini??
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Mini-Roundabout
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So why a mini-roundabout & what’s different about it?
So why a mini-roundabout & what’s different about it?
• First the “Why”….
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So why a mini-roundabout & what’s different about it?
• First the “Why”….▫ Background
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Tollgate Rd. & Marketplace Dr.1996
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So why a mini-roundabout & what’s different about it?
• First the “Why”….▫ Background▫ Need for traffic control
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So why a mini-roundabout & what’s different about it?
• First the “Why”….▫ Background▫ Need for traffic control▫ Significant Problem
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Law Department: “No”
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So why a mini-roundabout & what’s different about it?
• First the “Why”….▫ Background▫ Need for traffic control▫ Significant Problem
• Second…the “What”
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So why a mini-roundabout & what’s different about it?
• First the “Why”….▫ Background▫ Need for traffic control▫ Significant Problem
• Second…the “What”▫ “Still” a roundabout – with all applicable traffic rules
So why a mini-roundabout & what’s different about it?
• First the “Why”….▫ Background▫ Need for traffic control▫ Significant Problem
• Second…the “What”▫ “Still” a roundabout – with all applicable traffic rules▫ Size: 50’ – 90’ diameter
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So why a mini-roundabout & what’s different about it?
• First the “Why”….▫ Background▫ Need for traffic control▫ Significant Problem
• Second…the “What”▫ “Still” a roundabout – with all applicable traffic rules▫ Size: 50’ – 80’ diameter▫ Fully mountable central & splitter islands
So why a mini-roundabout & what’s different about it?
• First the “Why”….▫ Background▫ Need for traffic control▫ Significant Problem
• Second…the “What”▫ “Still” a roundabout – with all applicable traffic rules▫ Size: 50’ – 80’ diameter▫ Fully mountable central & splitter islands Generally no higher than 4-5” – but clearly visible
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So why a mini-roundabout & what’s different about it?
• First the “Why”….▫ Background▫ Need for traffic control▫ Significant Problem
• Second…the “What”▫ “Still” a roundabout – with all applicable traffic rules▫ Size: 50’ – 80’ diameter▫ Fully mountable central & splitter islands Generally no higher than 4-5” – but clearly visible
• http://safety.fhwa.dot.gov/intersection/roundabouts/fhwasa10007/
Case Study:Tollgate Road @ MacPhail Road• Design
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Case Study:Tollgate Road @ MacPhail Road• Design▫ Fit into the existing paving.
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Case Study:Tollgate Road @ MacPhail Road• Design▫ Fit into the existing paving▫ Much smaller than “normal” roundabout
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Case Study:Tollgate Road @ MacPhail Road• Design▫ Fit into the existing paving▫ Much smaller than “normal” roundabout ▫ Deflection, Stamped & Mountable Concrete,
Defined Pedestrian Paths
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Case Study:Tollgate Road @ MacPhail Road• Design▫ Fit into the existing paving▫ Much smaller than “normal” roundabout ▫ Deflection, Stamped & Mountable Concrete,
Defined Pedestrian Paths▫ Center Island Design (Conspicuous, Mountable)
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Case Study:Tollgate Road @ MacPhail Road• Design• Construction
Case Study:Tollgate Road @ MacPhail Road• Design• Construction▫ Closed entire intersection for 3 weeks to expedite
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Case Study:Tollgate Road @ MacPhail Road• Design• Construction• Completed Project
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Case Study:Tollgate Road @ MacPhail Road• Design• Construction• Completed Project▫ Volumes
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Case Study:Tollgate Road @ MacPhail Road• Design• Construction• Completed Project▫ Volumes▫ Evening Rush Hour & Nighttime Video
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Case Study:Tollgate Road @ MacPhail Road• Design• Construction• Completed Project▫ Volumes▫ Evening Rush Hour & Nighttime Video▫ “Special” Situations
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Case Study:Tollgate Road @ MacPhail Road• Design• Construction• Completed Project• Lessons Learned
Case Study:Tollgate Road @ MacPhail Road• Design• Construction• Completed Project• Lessons Learned▫ Vehicular Deflection
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Case Study:Tollgate Road @ MacPhail Road• Design• Construction• Completed Project• Lessons Learned▫ Vehicular Deflection▫ Traffic Control Signs
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Case Study:Tollgate Road @ MacPhail Road• Design• Construction• Completed Project• Lessons Learned▫ Vehicular Deflection▫ Traffic Control Signs▫ Turn Signals
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Just what is a mini-roundabout??
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Mini-Roundabout
Just what is a mini-roundabout??
We hope it’s the “future
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Just what is a mini-roundabout??
We hope it’s the “future”….with long term positive impacts similar to the “normal” roundabout:
Just what is a mini-roundabout??
We hope it’s the “future”….with long term positive impacts similar to the “normal” roundabout:
Modern Roundabouts: Circa 1990: Est. less than 1002010: Greater than 3,000
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Just what is a mini-roundabout??We hope it’s the “future”….with long term, positive impacts similar to the “normal” roundabout:
Modern Roundabouts: Circa 1990: Est. less than 1002010: Greater than 3,000
Mini-Roundabouts:Circa 2010: Est. less than 102030: ???
Thank You
Questions and Additional Information:
http://www.harfordcountymd.gov/dpw/engineering/TransEng/roundabouts.html
Harford County Government Roundabouts - Website
FHWA Mini-Roundabout Design Manual - Website
http://safety.fhwa.dot.gov/intersection/roundabouts/fhwasa10007/
Jeff Stratmeyer – Chief Engineer, Harford County, MD DPW
E-mail: [email protected]
