Risk-Oriented Design Approach

  • Posted on: Sun, 10/13/2013 - 22:19
  • By: shroedermay
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Common Reasons to Consider Exceptions

  • Impacts to the natural environment

  • Social or right-of-way impacts

  • Preservation of historic or cultural resources

  • Sensitivity to context or accommodating community values

  • Construction or right-of-way costs

 

Risk Management Characteristics

  • Explicitly addresses uncertainty

  • Based on the best available information

  • Part of the decision-making process

Access Management Issues and Techniques at Continuous Flow Intersections (CFI’s)

  • Posted on: Sun, 10/13/2013 - 22:14
  • By: shroedermay
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Outline

  • What is a CFI?

  • Why consider a CFI?

  • Access Management Issues at a CFI

  • Potential Access Solutions

  • Questions Comments

 

Potential Access Solutions

  • Inter-parcel Access

  • Service Roads

  • Partial Median Openings

  • Right-In Only Driveways

  • Right In-Right Out Driveway on CFI Leg

  • U Turns

  • Purchase Access Rights

  • Relocate/Add Driveway

Access Management Solutions with Roundabouts

  • Posted on: Sun, 10/13/2013 - 22:10
  • By: shroedermay
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Well-designed Modern Roundabouts enhance the achievement of Access Management principles

  • Maintain Integrity of Arterials

  • Balance Mobility and Access

  • Improve Safety

  • Reduce
    Congestion

  • Extend the life of
    Infrastructure

 

 

Roundabout Operational & Safety Characteristics:

  • Driveway and intersection spacing versatility

  • Geometric flexibility (properly designed)

  • Less queuing

Access Management Considerations at Four Innovative Intersections

  • Posted on: Sun, 10/13/2013 - 22:06
  • By: shroedermay
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Topics

  • New Jersey Jughandle Intersection (NJJI)

  • Displaced Left Turn Intersection (DLF)

  • Median U-Turn Intersection (MUT)

  • Restricted Crossing U-Turn Intersection (RCUT)

Summary

  • All unconventional intersection designs are conceived to take advantage of the local traffic pattern

  • Their main design objectives are to improve LOS of critical movements, maintain or improve overall safety at main intersection, and generate tolerable delays to non-critical movements

Access Management Considerations for High-Capacity Multi-lane Roundabouts

  • Posted on: Fri, 08/30/2013 - 23:23
  • By: fbroen
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Case Studies

Roundabouts Enhance the Achievement of Access Management Principles

  • Maintain Integrity of Arterials
  • Balance Mobility and Access
  • Improve Safety
  • Reduce Congestion
  • Extend the life of Infrastructure
  •  

Roundabout Operational Characteristics Allow for:

Development of Left-Turn Warrants for Unsignalized Intersections

  • Posted on: Fri, 08/30/2013 - 23:14
  • By: fbroen
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Bill Eisele
Development of Left-Turn Warrants for Unsignalized Intersections
TTI

Purpose of NCHRP Project 3-91

  • Develop objective and clear process for selection of left-turn lanes at unsignalized intersections
  • Provide guidance on the design of left-turn lanes

Conclusions

Access Control near Highway Interchanges

  • Posted on: Fri, 08/30/2013 - 22:55
  • By: fbroen
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Objectives

  • Review origin of current guidelines for access separation from interchange ramps
  • Review recent Virginia study on the relationship between access spacing from interchange ramps and crash rates
  • Suggest new standards for the optimum access point spacing

 

Findings and Recommendations: Access Spacing from Interchange Ramp

Field Evaluation of Restricted Crossing U-Turn Intersection

  • Posted on: Sat, 07/06/2013 - 19:34
  • By: fbroen
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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

Early Investigation of Access Points near Signalized Intersections

  • Posted on: Sat, 07/06/2013 - 18:57
  • By: fbroen
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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