Planning and designing of the planning and designing of the turbo roundabouts
Business Access and Associated Benefits Provided by ... · Traffic Planning with Roundabouts....
Transcript of Business Access and Associated Benefits Provided by ... · Traffic Planning with Roundabouts....
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ROUNDABOUT ANALYSIS, PLANNING, DESIGN, OUTREACH, EDUCATION
ITE Rapid City July 1st 2014 MTJ Roundabout Engineering Mark Johnson, PE608.238.5000www.mtjengineering.com
Business Access and Associated Benefits Provided by Roundabouts
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Introduction
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Introduction
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Introduction
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Roundabout Operational Characteristics Allow for:o Capacity at Intersection = Less Roadway Widthso Roadway Geometric Flexibility due to slower speedso Intersection Spacing Versatility o Different Access Control Opportunities
Traffic Planning with Roundabouts
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Traffic Planning with Roundabouts
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Traffic Planning Examples with RoundaboutsExample Project: Huffman Road Corridor,
Anchorage, AKo No Roadway Widening (3 Lanes) = const. within Ex. OW o Access Control Opportunities = Good Business Circulationo Improved Traffic Flow and Safety
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Traffic Planning with Roundabouts
Flared Entries, Lane drop at Exit
7 Lane Cross Section
7 Lane Cross Section
2 Lane Cross Section
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Case Studies
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Case Study Mt Horeb, WI
Roundabout Design
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STH 78/92 Mount Horeb, Wisconsin
2,000 VPH, 2,800 design Flared Two -lane entry
Two-lane Tapered Exit
Flared Two -lane entry, RT only
Two- Thru lanes WB
Single-lane entryVarying
circulating width 24-32’ *
* Business Access
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120’140’
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Mount Horeb, Wisconsin STH 78/92
Pedestrian Comparison
60s Signal 18s Roundabout
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Mount Horeb, Wisconsin STH 78/92
Trucks
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Mount Horeb, Wisconsin
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Mt Horeb, Wisconsin
~30k ADT
4 Lane~25k ADT
2 Lane
Traffic Planning with Roundabouts
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Roadway Planning9 Lane Structure
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Roadway Planning
3-4 LanesROW Saved
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ROUNDABOUT ANALYSIS, PLANNING, DESIGN, OUTREACH, EDUCATION
•ExperienceTraffic Planning with Roundabouts
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Development
Traffic Planning with Roundabouts
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600,000 square foot mixed retail development, ‘Green Oak Village Place
Traffic Planning with Roundabouts
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~150’
85’185’
Traffic Planning with Roundabouts
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Questions
Small Commercial Development
~600’
Grocery Store
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Small Commercial Development
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Questions
Small Commercial Development
~600’
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Questions
Small Commercial Development
~600’
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Questions
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Business Access
• 125’ ICD• Short Flared Two-Lane Entry• Single-Lane Entry • Aux RT Lanes (two types)
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Redevelopment
Monona, WI
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Redevelopment
Proposed Super Center 225,000 sq ft.$30M Project
Vacant Land Assessed = $6M
Full or LT Access Precluded by proximity to signal
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Redevelopment
* Business Access
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Redevelopment
135’
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TrucksTwo-lane approach
One-lane approach Source: MTJ
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Redevelopment
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Trucks Video Taken From Here
Source: MTJ
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Effective Lane Utilization with Flared Entry Design
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Project Area
1/28/14 37
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Proposed Project
1/28/14 38
California Boulevard Roundabouts– City of Napa
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Directional Signing-Way Finding
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Directional Signing- Simplified Entry
1/28/14 40
To Downtown
HISTORIC DOWNT OWN
DowntownNapa
HISTORIC DOWNT OWN
DowntownNapa
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411/28/14
Omni-Means - Built to Deliver
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421/28/14
Omni-Means - Built to Deliver
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431/28/14
Ramp Intersection Design Optimization
Accepting lane not readily visible to turning trafficLane Drop/Merge
in close proximity
2 Lanes of traffic & short decision distance from ramp entrance
Poor sight lines to approaching traffic
High speed lane drop (with green light)
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441/28/14
Ramp Intersection Design Optimization
Lower Exit Speeds from Roundabout (<25mph) with Lane Drop Completed Prior to Merge (30mph)
Single EB Thru Lane with designated right turn pocket and improved sight lines = easier decision making
Acceleration Lane to Accommodate Merge (35mph)
Raised Median Designates Pocket =Driver Comfort
Simplified Decision Making
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o Roundabout Operational Characteristics Allow for:o Capacity Improvement with Reduced Roadway Wideningo Intersection Spacing Versatilityo Access Control Opportunities for Improved Business Access and
circulationo Need further US research and publication to document these
differences.
o Need Research and Industry Documentation to Codify Roadway Planning Criteria for Roundabout Intersections
Traffic Planning with Roundabouts Summary
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Thank You/Questions
MTJ Roundabout EngineeringMark Johnson, PE608.238.5000www.mtjengineering.com