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Road Diets. Jennifer A. Rosales, P.E. Senior Professional Associate Supervising Transportation Engineer. Presentation to ACEC/ODOT April 15, 2008. Overview. What is a “Road Diet” Road Diet Handbook Case Studies Feasibility Factors Design Guidelines. Road Diet Concept. Lane Reduction
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Road Diets Jennifer A. Rosales, P.E. Senior Professional Associate Supervising Transportation Engineer Presentation to ACEC/ODOT April 15, 2008
Overview • What is a “Road Diet” • Road Diet Handbook • Case Studies • Feasibility Factors • Design Guidelines
Road Diet Concept • Lane Reduction • Four-to-two lane conversion • Benefits to all modes of transportation • Improved mobility and access • Improved livability and quality of life • Economic and community goals Photo simulation by Todd Boulanger, COV
Road Diet Concept Safety benefits • Reduced vehicle speeds • Reduced conflict points • Improved sight distance - Improved pedestrian & bike safety Graphics by PB
Road Diet Concept • Minimal effect on capacity • ADT thresholds • Traffic diversion 2-15 percent Photo by James Hencke, PB
Road Diet Concept • Simple as re-striping • Cost-effective • Optional enhancements • Enhances environment Photo by GB Arrington, PB Photo by James Hencke, PB
Road Diet Concept Other Road Diet Examples • One-way streets • Three to two lanes • Six to five lanes
PB’s commitment to Sustainability Road Diet Handbook: Setting Trends by Livable Streets Foreword Acknowledgments 1.0 Introduction 2.0 Previous Studies 3.0 Case Studies 4.0 Road Diet Guidelines Appendices References Graphic Courtesy of PB
Road Diet Case Studies • Toronto, Canada • Dunedin, New Zealand • Vancouver, Washington • Clear Lake, Iowa • Athens, Georgia Graphic Courtesy of PB
Livability Survey • Purpose – examine livability impacts • Survey modeled from Livable Streets • Street perceptions including traffic, safety, comfort • Street life activities • Reactions • Survey medium varied Photo by GB Arrington, PB
Road Diet Case Studies Fourth Plain Boulevard in Vancouver, Washington • Arterial ~ 17,000 ADT • Re-striping project in 2002 • Bike lanes • ADA ramps & utilities • Improved safety, mobility and access for all users Before After Photo credits: Todd Boulanger, COV
Road Diet Case Studies Fourth Plain Boulevard in Vancouver, Washington • Crashes 52 % • Traffic speeds 18 % • No traffic diversion • Pedestrian & bike benefits • Redevelopment and renovations • Measured economic growth • Easier to cross street • Street “feels” safer • 67% Yes, 21% Maybe, 12% No Before After Photo credits: Todd Boulanger, COV
Road Diet Case Studies Baxter Street in Athens, Georgia • Arterial ~ ADT 20,000 • Safety Demonstration Project in 1999 • Re-striping • Bike lanes • Transit corridor Before After Photo credits: David Clark, Athens-Clarke County, GA
Road Diet Case Studies Baxter Street in Athens, Georgia • Overall crashes 53 % and at unsignalized locations 60% • Traffic Diversion ~ 4% • Easier to cross street • Slower speeds • Home and business improvements • Perceived number of lanes and street width is "just right" • 47% Yes, 33% Maybe, 20% No Before After Photo credits: David Clark, Athens-Clarke County, GA
Road Diet Case Studies Kaikorai Valley Road in Dunedin, New Zealand • Arterial ~ 10,000 ADT • 2003 conversion • 4 to 2 lanes with CTL/median • Cycle lanes and landscaping • Exist Parking • Project length ~ 2.4 km (1.5 mi) Photo credits: Ron Minnema, Traffic Engineer, Dunedin City Council
Road Diet Case Studies Kaikorai Valley Road, Dunedin, NZ
Road Diet Case Studies Kaikorai Valley Road in Dunedin, New Zealand • Crashes 30 % • Pedestrians and bicyclists • No traffic diversion • Perceived # of lanes and street width "just right" • Home and business improvements • 42% Yes, 31% Maybe, 27% No Photo credits: Ron Minnema, Traffic Engineer, Dunedin City Council
Road Diet Case Studies US 18 in Clear Lake, Iowa • State Highway ~ 12,000 ADT • Re-striping project in 2003 • 4 to 2 lanes with TWLTL • Extra width – shoulders • Highway through town Photos by Jennifer Rosales, PB
Road Diet Case Studies US 18 in Clear Lake, Iowa • Crashes 65 % • Aggressive speeding 52% • Adequate traffic operation & good mobility • Mixed perceptions - striping confusing • Livability benefits still to be realized Photos by Jennifer Rosales, PB
Road Diet Case Studies St. George Street in Toronto, Canada • Minor Arterial ~ ADT 7,500 • Through University campus • Two project phases ’93 & ‘96 • Cycle lanes, on-street parking, wider sidewalks, urban landscaping • Alternate paving materials Photos by Jennifer Rosales, PB
Road Diet Case Studies St. George Street in Toronto, Canada • Crashes 40 % • Pedestrians and bicycles • No traffic diversion • Easier to cross street • Perceived slower speeds, "feels safer,” perceived increase in pedestrians and bicyclists • 81% Yes, 12% Maybe, 6% No Photos by Jennifer Rosales, PB
Road Diet Example – Tacoma Street, Portland • ADT 30,000 • 4 lanes to 2 lanes with center turn lane • On-street parking • Curb Extensions • Refuge Islands
Road Diet Example – Tacoma Street, Portland • Traffic Diversion – minimal • Peak hour traffic- spread • Overall Traffic • Speeding Decreased • Increased parking • Improved pedestrian environment Before After
Road Diet Handbook: Setting Trends by Livable Streets Foreword Acknowledgments 1.0 Introduction 2.0 Previous Studies 3.0 Case Studies 4.0 Road Diet Guidelines Appendices References Graphic Courtesy of PB
Road Diet Guidelines – Identification and Evaluation • Feasibility Factors • Roadway Function and Environment • Overall Traffic Volume and Level of Service • Turning Volumes and Patterns • Frequent-Stop and Slow-Moving Vehicles (Agriculture, Buses, Buggies) Reference: Knapp, Keith and K. Giese, Guidelines for the Conversion of Urban Four-Lane Undivided Roadways to Three-Lane Two-Way Left-Turn Lane Facilities Final Report, Iowa State University, April 2001.
Road Diet Guidelines – Identification and Evaluation • Feasibility Factors, cont. • Weaving, Speed, and Queues • Crash Types and Patterns • Pedestrian and Bicycle Activity • Right-of-Way Availability, Cost, and Acquisition Impacts • Presence of Parallel Routes • Other Contextual Considerations Reference: Knapp, Keith and K. Giese, Guidelines for the Conversion of Urban Four-Lane Undivided Roadways to Three-Lane Two-Way Left-Turn Lane Facilities Final Report, Iowa State University, April 2001.
Design Guidelines and Concepts • Traveled Way • Suggested Left-Turn Treatments • Transitions • Bicycle Facilities • On-Street Parking • Pedestrian Realm Graphic Reference: MUTCD, Federal Highway Administration, 2003.
Typical Road Diet Cross-Sections Graphics Courtesy of PB
Traffic Calming and Roundabout Options • Pavement texturing/coloring • Curb extensions • Medians • Landscaping • Street trees • Narrow streets • On-street parking • Chicanes • Chokers • Raised crosswalks • Raised intersections • Diagonal diverters • Selective enforcement Photo by Jennifer Rosales, PB
Green Street Options/Enhancements • Street Trees • Reduced Imperviousness • Permeating or Eliminating Curb and Gutter • Vegetative Filter Strips • Swales • Linear Detention Basin • Infiltration Trench • Infiltration Basin • Solar Photos by Jennifer Rosales, PB
Planning • Pavement reconstruction project or jurisdictional transfer • Other supporting conditions such as parallel route • Consider community requests • Tech evaluation and community involvement – keys to success • Pilot project study • With other corridor improvements • With concurrent pavement overlay projects.
Implementing • Public Education • Manage community expectations • Consider focus groups, workshops, open houses • Consider traffic calming • Consider “greening” • Include access management strategies • Address key intersection operations • Repair sidewalks and ramps • Police enforcement
Road Diets - Summary • Meet transportation need • Safety benefits • Livability Benefits • Asset to the community • Compatible with the environment • Cost-effective • “Better than Before”
Jennifer A. Rosales, P.E. PB rosales@pbworld.com Contact Information