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![Page 1: Idaho Transportation Department Project Development Conference Presented by Greg Laragan April 27, 2011 Freeway Geometric Design for Active Traffic Management.](https://reader037.fdocuments.us/reader037/viewer/2022102711/551c23c1550346ad4f8b5ca4/html5/thumbnails/1.jpg)
Idaho Transportation DepartmentProject Development Conference
Presented by Greg LaraganApril 27, 2011
Freeway Geometric Design for Active Traffic Management in Europe
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International Technology Scanning Program
Evaluates innovative foreign technologies and practices that could significantly benefit U.S. transportation systemsMore than 80 international scans since 1991
Sponsored by AASHTO, FHWA, and NCHRP
Scan reports accessible via FHWA Office of International Programswww.international.fhwa.dot.gov
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Scan Team Members• Jeff Jones (AASHTO Co-Chair), Assistant Chief Engineer of Design, Tennessee DOT • Martin Knopp (FHWA Co-Chair), Division Administrator, FHWA Florida & Puerto Rico Divisions• Kay Fitzpatrick (Report Facilitator), Senior Research Engineer, Texas Transportation Institute
• Mark Doctor, Safety and Design Engineer, FHWA Resource Center • Charlie Howard, Transportation Planning Director, Puget Sound Regional Council
• Greg Laragan, Assistant Chief Engineer, Operations, Idaho Transportation Department
• Jim Rosenow, State Geometrics Engineer, Minnesota Department of Transportation
• Brooke Struve, Design Program Manager, FHWA
• Bart Thrasher, Assistant State Location and Design Engineer, Virginia Department of Transportation
• Liz Young, Senior Supervising Transportation Planner, Parsons Brinckerhoff
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Purpose of Scan
To examine the design practices used with active traffic management techniques in other countries to improve the safety and operational performance of congested freeway facilities.
England The Netherlands
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Countries Visited
Spain (Valencia)Germany (Hessen, Rhineland/Pfalz)Netherlands (Den Hague, Delft)United Kingdom (Birmingham)
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Managed Motorways
Suite of complementary techniques applied to provide better safety and travel time reliability on motorway sections
Techniques integrate roadway design with operational strategies
The Netherlands (source:
presentation to scan team)
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Managed Motorway Strategies
Shoulder runningEmergency refuge areasOvertaking (passing) bansRamp metering
Traffic delay warningsAlternative route information
Traffic surveillance and monitoring Incident managementEnforcement (mobile and/or automated)
Variable speed limitsSpeed harmonizationLine (lane) controlQueue detection & warning systems
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Utilizing the hard (paved) shoulder as an additional running lane during peak and congested periods to facilitate greater volumes of traffic, minimize congestion and improve journey time reliability
Hard Shoulder Running (HSR)
The Netherlands
England
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Functionality of ShouldersModern perspectives on shoulder
functionalityFewer vehicle breakdowns than when
motorways were first constructedDiscouraged use of inside shoulder for
breakdowns
The Netherlands
England, driving on left
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Emergency Refuge Areas
Emergency refuge area added when shoulder is used (either temporarily or permanently)
Spacing of the refuge areas varied by facility and country
England (source: scan team)
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Germany: Sign LegendAlso Used in Netherlands
Germany (Source: Lemke, 4th International Symposium)
Use Hard Shoulder End Hard Shoulder Use Leave Hard Shoulder
(Source: Scan Team)The Netherlands
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Shoulder Running On
Shoulder Closed
Downstream
England: Potential Sign Legends for Entrance Ramp
(Source: presentation to scan team)
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Blank gray background: shoulder running not allowed
Shoulder running allowed
England: Sign Legends on Entrance Ramp
(Source: England Highway Agency)
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Shoulder Open thru Junction
Shoulder Closed thru
Junction
England: Potential Sign Legend for Exit Ramp
(Source: presentation to scan team)
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Pavement Markings
The Netherlands, note 9:3 spacing on Plus Lane markings compared to 3:9 spacing for markings on other lanes (source: Google Earth)
England, note solid lane line separating shoulder (closed to shoulder running) and travel lane (source: scan team)
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Pavement Markings for Shoulder Running through Junctions
England, At exit ramp
Netherlands,Downstream of entrance ramp
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Allocation of Cross SectionVariety of practices noted for reallocating
cross section to provide additional lane Narrowed lane widths between 2.75 and
3.50 m (9.0 to 11.5 ft) discussedIn some locations, lane widths varied
Narrower widths in the inside lanes (typically include truck no-passing restriction)
(Source: Lemke, 4th Geometric Design International Symposium)
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Variable Speed Limit
Each of the countries visited had a general practice of reducing the speed limits within sections having permanent or temporary shoulder running
Germany(Source: Hessen, Germany website)
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Speed Harmonization
Introduce via variable (reduced) speed limit
Improve flow of traffic Warn vehicle approaching back of queueAlgorithm
Uses data from surveillance (loops or cameras)
Automatically reduces speed based on real-time traffic conditions
Need to communicate reason for speed reduction
“Go slower to get there faster”
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Variable Message SignsEach of the countries visited also used
variable message signs
EnglandSpeeds in mph
(source: scan team)
(source: presentation to scan team)
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Traffic Surveillance & Incident Management
Service Patrols
In-Pavement Loop Detectors
Surveillance Cameras
Traffic Monitoring, Response and Management Centers
(source: scan team)
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Automated Speed Enforcement
The NetherlandsEngland
(source: scan team)
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Line (Lane) Control
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Line (Lane) Control
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Line (Lane) Control
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Performance Measures
Decrease congestionImprove travel time reliabilityImprove safety
01-03 2004 2005 2006 2007 20080
20
40
60
80
100
traffic accidents roadworks breakdowns
Du
rati
on
of
Con
-g
esti
on
in
Hessen
(h
r)
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Increased flows and reduced journey times suggests that 4 Lane Variable Speed Limits (4LVSL) is delivering real benefits
The graph to the left indicates the situation BEFORE 4LVSL
MonTue, Wed, ThuFridaySatSun
Increased flows and reduced journey times suggests that 4 Lane Variable Speed Limits (4LVSL) is delivering real benefits
The graph to the left indicates the situation AFTER 4LVSL
MonTue, Wed, ThuFridaySatSun
Performance Measures
Journey Time Reliability
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Performance MeasuresEuropean
countries have addressed safety concernsEngland,
Germany, and Netherland have identify improvements in safety
0.00 0.02 0.04 0.06 0.08 0.10 0.12
A27 Houten (Southbound)
A28 Zwolle (Westbound)
A1 Beekbergen (Westbound)
A1 Beekbergen (Eastbound)
Plus Lane
A50 Valburg (Southbound)
A50 Ewijk (Northbound)
A27 Lunetten (Northbound)
A50 Waterberg (Southbound)
A50 Waterberg (Northbound)
A2 Everdingen (Northbound)
A2 Everdingen (Southbound)
Hard Shoulder Running
Injury Accident Rate
Before
After
The Netherlands, 3 yr before data, 2 yr after data
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Planning
National or state policy drives solutions“Congestion Free Hessen”
Future technologiesTraffic managementMobility services
The Netherlands – Limited expansionEngland - “Deliver More for Less”
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Lessons Learned
The management and design approaches for a freeway corridor will differ as it ____ (evolves, matures, progresses)
Project will only be successful if public perceives it to be successful (despite what data may say)
Education of drivers and stakeholders is key
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Key ObservationsManaged Motorways work
Dynamically managing the use of the freeway cross section has great potential advantages for improving safety and mobility
Potential for great benefit in USAApplicable to all metro areas and high
volume corridors
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Key Observations
Paradigm shift in design policies and practices for actively managed freeway facilitiesRisk based and performance based design
decision makingDynamic vs. static approaches to design
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Key Observations
Synergistic relationship of traffic management conceptsIntegrated and dynamic approaches that
may evolve as needs and demands change (a continuum of freeway management)
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Key Observations
Emphasis on operations & enforcement
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Key Needs for ImplementationChampion at the highest levelOvercoming “we never did this before”
syndromeInstitutionalizing and culture changeFunding the continuing operations
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Scan Team Implementation PlanDissemination of Scan Findings and
RecommendationsEfforts to Gather Further Details on Key
IssuesResearch RecommendationsDeveloping Supplemental Design
Guidance
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Dissemination of Scan Findings and Recommendations
Summary ReportPresentations Disseminate Results of US Active Traffic
Management Pilot ProjectsUS Demonstration Showcase
Seattle – I-5, SR-520June 7-8, 2011
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Efforts to Gather Further Details on Key Issues
Coordination of Managed Freeway Geometric Design Practices with On-going Efforts for the Active Traffic Management Guidebook
Potential Application of United Kingdom’s (UK) Risk-Based Design Approaches for US Practices
Public Education and Stakeholder Involvement Needed for Success
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Research Needs
Signing and markings for U.S. applications
The Netherlands
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Research NeedsDriver understanding and information
overload concerns for managed lanes on high-volume “complex” freeways
Birmingham, England
England
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Research Needs Research is needed to understand the extent to which
European design standards are modified to implement ATM, and the considerations for making those design decisions.
Research is also needed to support updates of geometric design guidelines in the US for modification of the highway cross-section for ATM specifically in regard to:
Lane widthLane widening on horizontal curvesSight distance on horizontal curvesLateral offset and/or clear zoneRamp terminal designLocation and design of emergency refuge
(Source: Lemke, 4th Geometric Design International Symposium)
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Questions?
Final report available at:http://international.fhwa.dot.gov/pubs/pl11004/pl11004.pdf
Executive Summary available at:http://international.fhwa.dot.gov/pubs/pl11003/pl11003.pdf