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A Diet that WorksAMATS Road Diet Analysis
Curtis Baker, Planning AdministratorDavid Pulay, Transportation Engineer
October 2015
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Overview
• What is a Road Diet?
• The Big Picture– Why does an MPO care about Road Diets?
• AMATS Road Diet Analysis/Examples
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What is a Road Diet?
• Reduces the number lanes on a roadway• Most common conversion is four lanes to three
lanes• One lane in each direction with a continuous
turn lane• Dropped lane width is allocated to other users• Same pavement width, new lane configuration• Very little additional infrastructure cost
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Typical Configuration
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Benefits of a Road Diet• Safety
– Overall crash reduction of 19 to 47 percent– Less rear-end and left turn crashes through use of a
dedicated left turn lane– Calming effect on speed
• Fewer lanes for pedestrians to cross
• Extra width can accommodate other transportation modes such as bikes
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Benefits of a Road Diet
• Smoother traffic flow, less slow and go flow
• Best use of pavement when the capacity of a roadway is greater than the demand– Highways designed in 50’s and 60’s based on the
current growth patterns– Population projections never materialized
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Why We Care About Road Diets
• Transportation Funding Difficulties
• Regional Demographics
• Connecting Communities/Complete Streets
• Re-imagining Spaces
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Transportation Funding Difficulties
• Funding has remained unchanged while project costs continue to rise
• Bike and pedestrian connections often foiled by right-of-way/acquisition costs
• We can create important connections with minimal cost
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• Loss of population
• Lower traffic counts
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Connecting Communities and the Importance of Complete Streets
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Complete Streets
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Re-imagining Our Community
N Main St Akron - Existing
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Re-imagining Our Community
Photo: Tim FitzwaterN Main St Akron – During Better Block
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Re-imagining Our Community
N Main St Akron - Existing
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N Main St Akron – During Better Block
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StreetMix.com
Tempera Paint & Duct Tape
Tools
Baton Rouge
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The AMATS Road Diet Analysis
• Goal was to compile a list of streets where a road diet could be applied
• Start with an accurate inventory of roadways– GIS Database
– ODOT Office of Technical Services
– Highway Maintenance
Wolf Ledges Pkwy Akron
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The AMATS Road Diet Analysis
• Reduce the inventory by eliminating – Interstates and freeways
– Divided roadways (freeway look-alikes)
– Roadways with only two lanes
• In rare cases three lane roads and five lane roads can receive a road diet
Wolf Ledges Pkwy Akron
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The AMATS Road Diet Analysis
• Three lane roads must have unusually wide lanes– Reduce width of each lane– Allocate space for bike lane
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The AMATS Road Diet Analysis
• Road diet applied to five lane roads has to have extra space well defined
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The AMATS Road Diet Analysis
• Find average daily traffic (ADT)– Tier One: less than 10,000
– Tier Two: 10,000 to 15,000
– Tier Three: 15,000 to 20,000
– Over 20,000 is probably not a good choice
Wolf Ledges Pkwy Akron
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The AMATS Road Diet Analysis
• Determine peak hour volume– If this is not provided it is usually 8-12% of the ADT
• Determine directional peak hour volume– If this is not provided use “engineering judgment”– Peak hour directional volume less than 800-900
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The AMATS Road Diet Analysis
• Additional Analysis Recommended
– Tier 2 roadways (ADT 10,000-15,000) key intersections should to be analyzed, intersection spacing and length of queues considered
– Tier 3 roadways (ADT 15,000-20,000) key intersections should to be analyzed and corridor analysis for overall level of service
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The AMATS Road Diet Analysis
• Additional Considerations– Roadway function and it’s environment
– Continuity
– Railroad tracks - queues twice as long with less lanes
– Grades and slow moving vehicles
– Frequently stopping vehicles, especially buses
– Population and traffic volume trends
Opportunity Pkwy Akron
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The AMATS Road Diet Analysis
• Successful Implementation
– All stakeholders are part of the planning process
– Coordinate with resurfacing projects/schedules
– Community support
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Road Diet Examples
Copley Rd (SR 162) in Akron, ADT = 13,300
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South St in Akron, ADT = 1,920
Road Diet Examples
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South Main St in Summit Co., ADT ≈ 12,000
Road Diet Examples
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Road Diet Projects Planned
• E. Tallmadge Ave in Akron, ADT = 16,610
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Road Diet Projects Planned
• Cedar St/Exchange St in Akron, four one-way lanes, ADT = 10,390
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Maple St in Akron, ADT = 5,760
High Ranking Candidates
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Wolf Ledges Pkwy in Akron, ADT = 8,400
High Ranking Candidates
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E. Exchange St in Akron, ADT ≈ 10,000
High Ranking Candidates
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High Ranking Candidates
N. Main St in Akron, ADT ≈ 10,000
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Questions?
Curtis BakerPlanning Administrator, AMATSEmail: [email protected]
David Pulay, PETransportation Engineer, AMATS Email: [email protected]
www.amatsplanning.org