TRB Access Management AHB70

Increasing the awareness and use of Access Management

P Access Management 101

Access Management 101

Kristine Williams

2010 Conference

View Presentation


Kristine Williams leads this hour long introduction to Access Management. She covers:

  • What is Access Management?
  • The benefits of medians
  • Access, Connectivity and Congestion
  • Signal spacing
  • Driveway location and design
  • Benefits of networks
  • Cross access agreements
  • Corridor concepts

P What is Access Management?

Access Management seeks to limit and consolidate access along major roadways, while promoting a supporting street system and unified access and circulation systems for development. The result is a roadway that functions safely and efficiently for its useful life, and a more attractive corridor.


The information contained in this web site is maintained by members of the TRB Committee on Access Management. Information included here does not imply an endorsement by the Transportation Research Board, the National Academy of Sciences, the National Research Council, or the Federal Highway Administration.

P TRB 2012 Annual Meeting

Goto to use the interactive program guide: S=Session P=Poster M=Meeting

S 251 AHB70 Best Papers from First International Conference on Access Management Marriott Jan 23 2012 10:15AM- 12:00PM
P 397 AHB70 Impact of Access Management Research Marriott Jan 23 2012 4:15PM- 6:00PM
M AHB70 National Conference on Access Management Subcommittee, AHB70(1) Marriott Jan 24 2012 8:00AM- 9:45AM
M AHB70 Access Management Research Subcommittee, AHB70(2) Marriott Jan 24 2012 10:15AM- 12:00PM
M AHB70 Access Management Outreach Subcommittee, AHB70(3) Marriott Jan 24 2012 1:30PM- 3:15PM
M AHB70 Access Management Manual Subcommittee, AHB70(5) Marriott Jan 24 2012 3:45PM- 5:30PM
S 644 AHB70 Access Management Implementation, Safety, and Analysis Marriott Jan 24 2012 7:30PM- 9:30PM
M AHB70 Access Management Committee Marriott Jan 25 2012 8:00AM- 12:00PM

P 2008 Annual Meeting

 2008 Annual Meeting of TRB Committee ADA70, “Access Management”

Feb 26, 2007: The Access Management Committee is now located in the Operations Section in the Operations and Maintenance Group. The new committee code is AHB70.

View these presentations from the TRB 2008 Annual Meeting Sessions


Intergovernmental Partnering on Corridor Studies (08-2338)
Chris W. Huffman, Kansas Department of Transportation
Click here to view presentation 
  Methodology to Evaluate Effects of Access Control near Freeway Interchange Areas (08-1300)
Huaguo Zhou, University of South Florida
Kristine M. Williams, University of South Florida
Waddah Farah, Florida Department of Transportation
Click here to view presentation
Safety Impacts of Access Control Standards on Crossroads in the Vicinity of Highway Interchanges (08-1113)
Alejandra Medina Flintsch, Virginia Polytechnic Institute and State University
Hesham Ahmed Rakha, Virginia Polytechnic Institute and State University
Mazen Arafeh, Virginia Polytechnic Institute and State University
Dhruv Dua, Virginia Polytechnic Institute and State University
Abdel-Salam Gomaa Abdel-Salam, Virginia Polytechnic Institute and State University
Montasir M. Abbas, Virginia Polytechnic Institute and State University
Click here to view presentation


  Impacts of Separation Distances Between Driveway Exits and Downstream U-turn Locations on Safety Performance of Right Turns Followed by U-turns (08-0762)
Pan Liu, University of South Florida
Jian Lu, University of South Florida
Hongyun Chen, University of South Florida
Gary Sokolow, Florida Department of Transportation
Click here to view presentation
  Detailed Study of Driveway Collision Patterns in an Urban Area (08-0710)
Jonathan Rawlings, University of Arkansas
J. L. Gattis, University of Arkansas
Click here to view presentation
  Correlating Access Management with Crash Rate, Severity, and Collision Type (08-0209)
Grant G. Schultz, Brigham Young University
Kordel T. Braley, Hales Engineering
Tim Boschert, Utah Department of Transportation
Click here to view presentation


  Video is available on-line.To request a disc, please contact Neil Spiller(
  A companion print version Primer is available in .pdf form.

P 2012 Conference

10th National Conference on Access Management and TxDOT Planning Conference

JULY 17-19, 2012 DALLAS, TEXAS

The 10th National Conference on Access Management will be held in conjunction with the TxDOT Planning Conference at the Hyatt Regency Hotel in downtown Dallas, Texas July 17-19, 2012. The conference will draw together engineers, planners, consultants, land developers and academia from across all fields of highway planning, design, operations, and engineering. Accepted papers and/or presentations will be published in the conference proceedings. There is a particular interest in hearing from practitioners who have first-hand experience with techniques and implementation.

View Presentations                List of Presentations

Final Program

The conference program is being developed to meet your professional needs through the dissemination of the latest information by noted professionals in the transportation field. We look forward to seeing you in Dallas!

Special thanks to the following organizations for assisting in the planning of the 2012 conference:

  • Association of Texas Metropolitan Planning Organizations
  • Federal Highway Administration
  • Federal Transit Administration
  • North Central Texas Council of Governments – NCTCOG
  • Dallas Area Rapid Transit – DART
  • TxDOT, Environmental Affairs Division Staff
  • TxDOT, Dallas District
  • TxDOT, Public Transportation Division Staff
  • TxDOT, Transportation Planning and Programming Division Staff
  • TRB Access Management Committee


RN Update of the TRB Access Management Manual

View TRB Research Needs Statement



Update of the TRB Access Management Manual


Access management addresses the three following topic areas identified by the National Surface Transportation Policy and Revenue Study Commission: 1) Safety, 2) Congestion, and 3) Freight Movement. Access management practices and techniques have been found to reduce vehicular crashes by as much as 70%; whereas an increase in the number of access points from 10 to 60 per mile has been found to result in a four-fold increase in vehicular crashes. Access management can also mitigate congestion by reducing traffic conflicts, thereby increasing throughput and enhancing highway freight movement.

The Access Management Manual published by the Transportation Research Board in 2003 has proven to be a valuable resource to state, regional and local personnel concerned with transportation systems management and improved access management. As of January 2008, some 3000 copies have been sold. The Manual is also the text for the revised National Highway Institute Course No. 133078, “Access Management, Location and Design”. It is important that it contain current and up-to-date information regarding research and access management practices.

The TRB Access Management Committee has identified gaps in the material covered in the Manual and has received comments from users regarding the need for more information on certain topics. In particular there is a desire for additional information relative to the following:

  • Methodology for establishing access management categories and additional state and local government examples
  • Access management in the vicinity of interchanges (possible new chapter)
  • Integrating access management into transportation planning
  • Performance measures for evaluating an access management program
  • The effect of access management on limiting congestion, increasing throughput, improving fuel efficiency, and reducing vehicular emissions.
  • Additional information on reducing vehicular crashes and improving pedestrian and bicycle safety.
  • Economic effects of access management
  • Guidelines for access location and design elements to be addressed in a corridor plan
  • Short range and long range strategies for implementing corridor access management plans including supporting circulation, site plan review, traffic impact assessment, funding mechanisms and local land development regulations
  • Additional examples of corridor plans including plan development and implementation; examples of interagency agreements, access management overlay zones, and other practices for plan implementation
  • Examples of effective intergovernmental coordination and cooperative agreements for access permitting
  • Examples of effective outreach by state DOT’s and local government to develop support for access management
  • Procedures for maintaining consistent application of access regulations and monitoring the permitting process
  • Right-turn lane warrants and design
  • Left-turn lane warrants and design
  • Driveway design guidelines
  • Site design and site plan review/approval strategies to implement access management
  • State and local government practices for traffic impact assessment and developer mitigation in support of access management and alternative funding mechanisms
  • Access management strategies and practices for small municipalities and rural/sparsely developed areas
  • Access management practices and application of access management standards and roadways in existing developed areas
  • Access management standards and procedures for deviation from adopted standards
  • Emerging, or overlooked, access management techniques such as: acquisition of development rights, transfer of development rights, inclusive of conditions of use on the access connection permit, use of the building permit or certificate of occupancy permit by local government to promote access management
  • Multi-modal aspects of access management (e.g., bicycle, pedestrian and transit interface; susceptibility to left-turns, frequency of driveways, driveway design, median refuge, maintaining pedestrian/sidewalk connectivity in a hierarchical street network)
  • Lessons learned; do’s and don’ts


Since the Access Management Manual was published by TRB in 2003, several sources of new information such as the following become available.

1. Publication of the following NCHRP Reports and Syntheses:

  •  NCHRP Report 546: Incorporating Safety into Long Range Transportation Planning
  •  NCHRP Report 534: Safety of U-turns at Unsignalized Median Openings
  •  NCHRP Report 548: A Guidebook for Including Access Management in Transportation Planning
  •  NCHRP Synthesis 304: Driveway Regulation Practices
  •  NCHRP Synthesis 332: Access Location on Crossroads in the Vicinity of Interchanges
  •  NCHRP Synthesis 337: Cooperative Agreement for Corridor Management
  •  NCHRP Synthesis 351: Acquisition of Access Rights

2. Current NCHRP Projects:

  •  NCHRP Project 15-35: Geometric Design of Driveways
  •  NCHRP Project 03-72: Lane Widths, Channelized Right-Turns and Right-Turn Deceleration Lanes
  •  NCHRP Project 03-91: Guidance for the Provision of Left-Turn Lanes at Unsignalized Intersections

3. Papers presented at the 2004, 2006, 2008, and scheduled 2010 Access Management Conferences, as well as the 2003, 2005 and 2007 Urban Street Symposium and selected papers presented at ITE, TRB and APA.

4. Several state transportation agencies have also funded access management studies or engaged in the development of significant new access management resources. These are too numerous to list here. For example, Florida alone has produced the following studies and resources since the Manual was completed:

  •  Work Plan for FDOT Site Impact Handbook Update (2008, underway)
  •  Analysis of Corridor Management Practices on Selected Critical SIS Facilities (FDOT 2007)
  •  BD545-14, Development of Guidelines for Driveway Location and Median Configuration in the Vicinity of Interchanges (FDOT 2006)
  •  Florida Driveway Handbook (FDOT, updated 2006)
  •  Florida Median Handbook (FDOT, updated 2006)
  •  Effective Strategies for Comprehensive Corridor Management, (FDOT 2004)
  •  Costs and Benefits of Strategic Acquisition of Limited Access Right-of-Way at Freeway Interchange Areas (FDOT 2004)
  •  Model Regulations and Plan Amendments for Multimodal Transportation Districts (FDOT 2004)

5. Additionally, more than 50 papers and other sources of new information have been identified.


The objective of this research activity is to develop a revised and updated Access Management Manual. This objective will be accomplished by the following key tasks:

  1. Assemble research reports and papers published since preparation of the first edition of the Access Management Manual.
  2. Obtain additional examples relative to access management programs and practices of state DOT’s and local governments, such as comprehensive access management programs, outreach, permitting, corridor plans and their implementation, state regulations, local ordinances, access management standards, criteria and procedures for deviations from adopted standards, and other administrative practices and procedures.
  3. Compare the new information of the organization and content of the existing Access Management Manual.
  4. Proposed a revised structure and contents including revisions to existing chapters and possible new chapters for the Project Panel’s review and approval.
  5.  Prepare and submit a draft of a revised and updated Access Management Manual for TRB’s consideration, approval and publication.


Is it estimated that this project will require funding of at least $250,000 and require 24 months to complete.


As stated in SAFETEA-LU, “Surface transportation research and development shall include all activities leading to technology development and transfer, as well as the introduction of new and innovative ideas, practices and approaches through such mechanisms as filed application, education and training and technical support.” The Access Management Manual supports the implementation of innovation through technical support, training and education. Technical support is provided to transportation professionals at the state, regional and local governments as well as by consultants in the development of access management plans, regulations, design standards, access management practices and procedures and in making access related decisions involved in the development and redevelopment of property abutting the nation’s major roadways. Education and training functions are addressed through use of the Manual as the text for NHI Course No. 133078 (the course is typically taught eight to ten times per year, with up to 30 participants per course offering).


Kristine Williams, Chair TRB Committee AHB70
Vergil G. Stover, College Station, Texas
Gary Sokolow, Florida DOT


Gary Sokolow
Florida Department of Transportation
Systems Planning
605 Suwannee St., #19
Burns Building, SRD Unit 3920
Tallahassee, Florida 32399
(850) 414-4912
Fax: (850) 414-4876


DOC TRB Access Management Manual

Ordering Information

The “must have” book for every transportation engineer and planner.

Transportation Research Board’s Access Management Manual provides technical information on access management techniques, together with information on how access management programs can be effectively developed and administered. It presents access management comprehensively, in an effort to integrate planning and engineering practices with the transportation and land use decisions that contribute to access outcomes.

Practical information on a range of issues and applications was incorporated throughout the various chapters, drawing upon the knowledge of the many experienced practitioners that participated in development of the manual. Among the topics addressed by the Manual are:

  • Principles and effects of access management;
  • Steps in developing an access management program;
  • Access management techniques;
  • The role of states, metropolitan planning organizations, and local governments;
  • Location and design procedures for access features;
  • Case examples of agency policies, plans, practices and programs;
  • State statute and regulatory prototypes;
  • Techniques for working with th public on access managment issues; and
  • Legal considerations

Order your Access Management Manual today! Click here for TRB Website Link.(

Comments and Updates

With completion of the manual, the TRB Committee on Access Management has established Subcommittee A1D07(5), the Access Management Manual Subcommittee, for the purpose of continuing to refine and update the manual, as well as to receive comments and provide recommendations for future editions.

The TRB Access Management Manual is just one step in the Committee’s efforts to provide a definitive and comprehensive source of the latest information on access management. Plans are underway to promote research to identify best practices and to further advance the state-of-the-art in access management. There are, also, efforts to mainstream access management into traditional transportation processes and programs. Case studies and field studies will be encouraged as well.

If you have a documented case study, new policy, access management plan, or any other material you feel will be helpful to the Committee in this update effort, please submit your information to us via the e-mail address below and we will consider it in the next update.

Send your question, comment, or suggestion pertaining to the Access Management Manual to

Project Background and Audience

Access management is much more than driveway regulation. It is the systematic control of the location, spacing, design and operation of driveways, median openings, interchanges, and street connections. It also encompasses roadway design treatments such as medians and auxiliary lanes, and the appropriate spacing of traffic signals.

In the past few decades, a substantial amount of research has been conducted on access management. In addition, a growing number of agencies have initiated access management policies, plans and programs. These activities have provided insights into the impacts of access management techniques, identified best practices, and have generated recommended guidelines for access management applications. Yet this information is dispersed across a variety of sources, making it difficult for practitioners to locate, evaluate and apply.

The TRB Access Management Committee (A1D07) initiated a project in the 1996 to compile the best of this information into a single comprehensive resource that documents the state of the art in access management. The Access Management Manual is the culmination of this multiyear effort.

The manual was prepared by the Center for Urban Transportation Research at the University of South Florida, with the oversight and assistance of the TRB Committee on Access Management and its Subcommittees. The Federal Highway Administration provided funding for the project, and the Florida Department of Transportation assisted with contract management.

A goal of the project was to provide information of use to practitioners, as well as other stakeholders that are involved in or affected by access management actions. As with most transportation and land use issues, access management has many dimensions. It crosses jurisdictions, organizational lines, and professions.

The primary professions that guide development planners, engineers, and architects have important roles in determining access outcomes. Other key players include developers, elected and appointed officials, citizens and attorneys who interact with each other and agency staff to shape public policy and access decisions.

A variety of jurisdictions may also be involved including state transportation agencies, local governments that share a transportation corridor, and environmental agencies that address land use and development issues. Therefore, access management also requires partnerships within organizations and greater awareness of how decisions of one division affect the next. Government agencies must collaborate – both internally and with other agencies if they are to manage access effectively.

Because access management is multidimensional, the manual is multidisciplinary and comprehensive. State transportation agencies, local governments, metropolitan planning organizations and their consultants will find information of relevance to program development, implementation, and access design. The manual can also serve as a reference tool for policy makers, developers, and other interested parties that are weighing access management issues or actions.


February 2004

Table 2-5 of the Access Management Manual contains a typographical error.
The attached table indicates the accurate data, with revisions highlighted in red. (pdf version – 80K)

DOC Errata TRB Access Management Manual 2003

February 2004

Table 2-5 of the Access Management Manual contains a typographical error.
This table indicates the accurate data, with revisions highlighted in red. (pdf version – 80K)

TABLE 2-5 Summary of Research on the Effects of Access Management Techniques (13)
Treatment Effects
1. Add continuous TWLTL • 35% reduction in total crashes• 30% decrease in delay

• 30% increase in capacity

2. Add nontraversable median • 35% >55% reduction in total crashes• >30% decrease in delay

• >30% increase in capacity

3. Replace TWLTL with a
nontraversable Median
• 15%-57% reduction in crashes on 4-lane roads• 25%-50% reduction in crashes on 6-lane roads
4. Add a left-turn bay • 25% to 50% reduction in crashes on 4-lane roads• up to 75% reduction in total crashes at unsignalized access

• 25% increase in capacity

5. Type of left-turn improvementa) painted

b) separator or raised divider

• 32% reduction in total crashes• 67% reduction in total crashes
6. Add right-turn bay • 20% reduction in total crashes
•Limit right-turn interference with platooned flow, increased capacity
7. Increase driveway speed from
5 mph to 10 mph
• 50% reduction in delay per maneuver; less exposure time to following vehicles
8. Visual cue at driveways,
driveway illumination
• 42% reduction in crashes
9. Prohibition of on-street parking • 30% increase in traffic flow• 20%-40% reduction in crashes
10. Long signal spacing with
limited access
• 42% reduction in total vehicle-hours of travel• 59% reduction in delay

• 57,500 gallons fuel saved per mile per year

DOC FHWA Medians and Pedestrians Brochure

The Federal Highway Administration (FHWA) strongly encourages the use of raised medians (or refuge areas) in curbed sections of multi-lane roadways in urban and suburban areas, particularly in areas where there are mixtures of a significant number of pedestrians, high volumes of traffic (more than 12,000 vehicles per day) and intermediate or high travel speeds. This document expands on the FHWA guidance memo detailed here: can be ordered here.

Last Modified Date: 12/20/2010
More info at: