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Lindley, J., Guidance Memorandum on Consideration and Implementation of Proven Safety Countermeasures, FHWA, Washington DC, July 2008.
NHTSA, Traffic Safety Facts 2008 Pedestrians, NHTSA, Washington, DC, 2009.
Wilson, Petritsch, Quantifying Countermeasure Effectiveness, Orlando, FL, PBIC, November 2008.
Pedestrian and bicycle professionals sometimes encounter resistance when proposing crash countermeasures, due either to competing interests along a corridor or the desire to cut costs. Quantifying the effectiveness of corridor-length countermeasures such as medians, lighting and bicycle lanes will help proponents make a better case for these elements.
Williams, K. and K. Seggerman, Model Regulations and Plan Amendments for Multimodal Transportation Districts, National Center for Transit Research, Center for Urban Transportation Research, Tampa, FL, (2004)
This report includes suggested comprehensive plan amendment language and land development regulations that relate to access management in a multimodal environment.
Kikuchi, S. and N. Kronprasert, Determining the Length of the Right-turn Lane at a Signalized Intersection, Transportation Research Record 2060, Transportation Research Board of the National Academies, Washington, D.C. (2008) pp. 19-28.
Boonsiripant, S., M. Hunter, K. Dixon and M.O. Rogers, Measurement and Comparison of Acceleration and Deceleration Zones at Traffic Control Intersections, Proceedings of the 89th Annual Meeting of the Transportation Research Board, ( 2010)
Case Studies Slide Titles SH 6 Access Management Study, North Study Area Land Uses Driveway Density LOS AM/PM Project History Continuous Public Involvement Public Involvement Exercises Traditional Access Management Tools Raised Medians Signal Modification Addition of Turn Lanes Traditional Access Management Tools Internal Circulation, added Backage Roads and Removal of Signals made Unnecessary Innovative Tools more green time Innovative tools - Continuous flow intersection (CFI) Innovative tools Median U-turn intersection Innovative tools Recommendations Results
Revitalizing Aging Highway Corridors by Developing Context Zones and Access Management Standards Case Study Slide Titles US 1/US 78 Corridor Study Public Participation What happens if we do nothing? This could happen Going from this . To this, requires planning. What happens if we plan? We will improve safety and enhance mobility options What happens if we do nothing? We create more issues that must be resolved What happens if we plan? We improve traffic operations. Topics U.S. 1/U.S. 78 Corridor Study Area Augusta MPO Area U.S. 1/U.S.
Case Studies Slide Titles Why Study is Needed Study Area Adjacent Freeway Design Freeway Footprint Why Study is Needed Land Use and Transportation Development Pattern - Nodal Land Use Considerations Existing Development Pattern Development Pattern Interchange/Intersection Recommendations Access Management Access Function Unoccupied Property Unoccupied Property Starlite Motor Lodge low density along the highway English Village Inn Unoccupied Building Old Circuit City Old Michaels Vacant Lot Davids Bridal Our highways has become America's Main Street Roadway Recommenda
Outline Sustainability Definition Need for Sustainable Transportation Need for Access Management Common Themes? Qualitative Discussion Rating Systems Future Research Conclusions Side Titles A Basic Connection: Access Management and Sustainability Outline Sustainability Definition Sustainability Definition Need for Sustainable Transportation Need for Access Management Common Themes?
Network Planning and Development Strategies for Access Management
The lack of access control along arterial highways has been the largest single factor contributing to the obsolescence of .an entire generation of new arterial facilities built only a short while ago.
- Road Map
- How do you engage the problem?
- Think Show Ask
- What do you think?
- Next Steps
- Road Map
- Access Management
- Access Management improves safety by reducing traffic conflicts
- Conflict Points
- Business revenue
- Road Map
- Think Show Ask
The ultimate goal of this ambitious program is to transform Abu Dhabi into the sustainable capital of the Arab world. The Abu Dhabi Department of Transport (DoT) was established in 2006 combining agencies of Aviation, Maritime, Public Transport and Highways They are creating about 25 manuals Current Status Change in Framework Started with Manual (2010) following TRB AM Manual, like they follow the Green Book, but directed switch to directive language regulations. May produce a training manual in the future.
A National Survey on Public Use in Freeways and Corridors Presentation Outline Surveys TxDOT Survey Vendor Survey National Survey Format Results Interesting Findings Slide Titles Pylon Use: A National Survey Presentation Outline Survey Purpose Survey Format Terminology Vendor Interviews Survey Questions Survey Response Rate National Flexible Pylon Usage TxDOT District Pylon Usage Why Pylons Vs Barriers Other Reasons to use Pylons Pylons Vs Buffer Guidance Maintenance Reasons for Missing Pylons Maintenance Agencies Performing Evaluations Beneficial? When To Implement?
Overview Review of Sight Distance Components Common Sight Distance Applications to Access Management Sight Distance What, When, and Where Concluding Remarks Slide Titles Another Look at Sight Distance Applications for Access Management Overview Sight Distance Review of Candidate Sight Distances Basic SSD Assumptions Review of Candidate Sight Distances Basic DSD Assumptions Review of Candidate Sight Distances Common Applications That Consider Sight Distance for Access Management Looking at Stopping & Decision Sight Distance Assumptions Basic Questions Stopping Sight Distance fo
Field Evaluation of Restricted Crossing U-Turn Intersection The Maryland Experience Presentation Outline The Safety Issue To Be Addressed RCUT Concept Suitable traffic conditions for RCUT implementation Control parameters FHWA Evaluation Evaluation results Conclusions Slide Titles Field Evaluation of Restricted Crossing U-Turn Intersection (RCUT) Presentation Outline The Safety Issue To Be Addressed RCUT Concept Suitable Traffic Conditions for Using RCUT RCUT Control Parameters U-Turn Opening Location FHWA Evaluation Driver Behavior Study Signing Study (minor road lanes not
Restricted Crossing U-Turn (RCUT) Intersection Safety Analysis The North Carolina Experience
North Carolina State University
Determine the safety and operational benefits of superstreets for NC motorists
Fulfill the need for capacity and level of service methodology
Objective Develop a statistical model to estimate the number of access point related collisions occurring at access points near signalized intersections Provide guidelines for site planners to distinguish higher collision sites from lower collision sites and eventually prevent constructing these sites Slide Titles Early Investigation of Access Points near Signalized Intersections Access Point Safety Objective Scope Literature Review Data Preparation Modeling Methodology Collision Model Higher Collision Sites Higher Collision Analysis Contributing Factors Recommended Guideline Research
Access Management Regulations Roadway Classification Access Management Standards Permitting Retrofit Projects Cost is borne by the public Benefits accrue to the public Conclusions B/C criteria are applicable to retrofit projects Warrants for permitting should be lower than for retrofit
- Application of Differing Widths
- Standards Summary
- Geometric Impacts of Widths
- Previous Safety Research
- Highway Safety Manual Results
- Applications of Existing CMFs
- Future Research
- Before and After Study with Differing Widths
- Statewide Data Review to update 1993 FHWA Report
- Trends in Median Width Treatments
Birk, M. and R. Geller, Bridging the Gaps: How Quality and Quantity of a Connected Bikeway Network Correlates with Increasing Bicycle Use, Presented at the Transportation Research Board 85th Annual Meeting (2006)
Van Schalkwyk, I. and V.G. Stover. Revisiting Existing Warrants for Left-turn Lanes at Unsignalized Intersections on Two-Way Roadways, Paper 07-0784, Presented at the 86th Annual Transportation Research Board meeting, Washington, D.C. (2007)
A vast body of literature has been produced on the topic of access management, including research reports, peer reviewed papers, and government policy documents. In addition, the scope of the TRB Access Management Manual (AMM) is not only cross cutting, but has expanded further to address non-auto modes of transportation in more detail.
We know that highways are the most dangerous facilities s on the face of the earth. AND we know that access related crashes represent over 55 percent of all reported accidents. We need to become more focused on Highway safety improvements In the last 10 years, over 430,000 dead. Guides and manuals are not enforceable – its actually the agencies engineering authority, usually through the chief engineer. It’s the opinion of the chief engineer, using guides and manuals as references, as compared to the wishes of the property owner.
III. RESEARCH PROBLEM STATEMENT
The purposes of this research are three-fold:
III. RESEARCH PROBLEM STATEMENT
Access management treatments inherently reduce conflict points along urban arterial roadways. The reduction in conflict has translated to a reduction in crashes that has been documented in numerous studies looking at before and after conditions when access management treatments (i.e., raised median installation, driveway consolidation) are implemented. Crash rate reductions as high as 50 percent have been reported in these analyses.
Modern roundabouts have been shown to be a safe and efficient alternative to more traditional roadway intersection designs. They are much more efficient than signalized intersections in many situations in that traffic is allowed to remain in motion albeit at a slower speed. Safety is often improved since traffic speed through the roundabout is reduced and the most serious types of conflicts are reduced or eliminated.
I am AM. AM I am. That damn AM! That damn AM! I do not like that damn AM! Would you like to get there SAM? It can help you to your house. I can show you with my mouse. Do not bother with your mouse. I just want to be a grouse. I want my driveway here and there, I want my driveways everywhere. You can safely drive your car. You can drive from very far. Medians can make life grand -- If you can only understand. I do not care if you agree, I only want what pleases me, I want them here so fast, fast, fast, Why should I worry 'bout their cast? You will like AM, you'll see.
Federal Highway Administration (FHWA), Safety Benefit of Raised Medians and Pedestrian Refuge Areas, FHWA-SA-10-020, (2010) This document is an excellent summary of the safety benefits of medians for pedestrians, pedestrian access to transit stops, pedestrian crossing maneuvers, as well as benefits of medians in general. It includes several references that will be useful as well. It is of significant value to the AMM2 chapters and sections on impacts of access management techniques and pedestrians. Key findings are reproduced below.
Harmelink, M. D. Volume Warrants for Left-Turn Storage Lanes at Unsignalized Grade Intersections, Highway Research Record, No. 211, Highway Research Board, National Research Council, Washington, D.C. (1967), pp. 1-18.
Fitzpatrick, K. and T. Wolff, Left-turn Lane Installation Guidelines, Proceedings of the 2nd Urban Street Symposium, Transportation Research Board, Anaheim, California (2003)
The objective of this synthesis was to summarize the key findings of various geometric design research efforts published in the 1990s. In the decade following the publication of the 1990 edition of AASHTOs A Policy on Geometric Design of Highways and Streets (also known as the Green Book), the research community conducted a large amount of research with potentially significant implications on safety and operations. The primary goal of this synthesis was to capture and distribute that information for consideration in the development of the 2004 edition of the Green Book.