TRB Access Management AHB70

Increasing the awareness and use of Access Management

2013 Mid-Year Meeting Agenda

Dear Access Management Committee Members and Friends,

I hope everyone enjoyed the Memorial Day Holiday weekend.   I am writing to remind you that the early bird registration for our mid-year meeting in Irvine, CA is this coming Saturday, June 1st.    If you haven’t already, please visit the site below to register for the meeting:

The draft agenda (see attached detailed subcommittee agenda), lodging information, and workshop registration information are provided on the website.  Over the next few weeks, our four subcommittee chairs will be holding teleconference meetings to prepare for the summer meeting.  I encourage you to participate in these preparatory meetings as we look to the access management committee future.   If you are interested in assisting with the efforts, please let me know.

I look forward to seeing all of you at the meeting later this summer!   If you are unable to attend, please let Christina and I know in advance.


Marc Butorac, Chair

Day, Date



Access Management (AHB70)

Tuesday, July 30, 2013

5:15 pm – 6:45 pm Research Subcommittee

Wednesday, July 31, 2013

1:00 pm – 2:30 pm Manual subcommittee
2:30 pm – 4:00 pm Outreach Subcommittee
4:10 pm – 5:00 pm Conference Subcommittee

Thursday, August 1, 2013

8:00 am – 12:00 am Committee Meeting

Oregon Access Management Best Practices Manual

Developing an Oregon Access Management Best Practices Manual: Final Report

The Oregon Department of Transportation has released a report that reviews development of its Access Management Best Practices Manual, which will be used to help transportation professionals quantify and evaluate safety and operational effects of access management strategies.

This Summary Last Modified On: 2/26/2013 from
More information about Oregon’s Access Management Program

Roundabout Info

Almost everything available  is in NCHRP Report #672 on Roundabouts.

Site has much more if you are investigating RBTs

I use FHWA and my own material for my roundabout webinars.

And the rest of the safety site is the best I have found for all research material on every aspect of roadway safety.

View presentations from the past Roundabout Conferences

Before-and-After Safety Study of Roadways Where New Medians Have Been Added

Research Report: Florida Department of Transportation (FDOT)

The FDOT report documents the results of an investigation of the safety impact of median conversion from two-way left-turn lanes (TWLTL) to raised medians at 18 locations. The evaluation covers several median and roadway design features. The research includes a survey of business owners to gauge their reaction to the median conversion.

Overall, the results showed a 30.3 percent reduction in the total crash rate after median conversion.

Another main objective of this study was to document the experience of businesses on corridors that were recently converted from TWLTLs to raised medians and their involvement in the public information process. On-site interviews of businesses at 10 roadway segments were conducted and responses from 151 businesses were included in the analysis. The majority of the responding Businesses perverted TWLTLs to raised medians for better access and ease of truck deliveries. Two thirds of the responding businesses thought that raised medians were safer than TWLTLs. Of the 151 businesses, 40 indicated they were informed of public hearings  on the raised median construction projects. Of these, only 13 indicated they attended at least one public hearing.

TRB Intersections Joint Subcommittee Newsletter 2013

Hello Member, Friend or Acquaintance of the TRB Intersections Joint Subcommittee,

I am pleased to distribute the attached IJS 2013 Annual Meeting Newsletter.  Inside you will find the latest information on IJS and sponsoring committee meetings for next week (including the IJS meeting agenda), several poster and podium sessions of interest, and a short summary of recent intersections related activities.  I would like to recognize and thank Jonathan Soika for his efforts in preparing this newsletter.


Please note that in addition to conducting our regular subcommittee business, our meeting will also feature brief presentations on the FHWA Highway Safety Information System, an HSIS-based study on Safety Impact of Intersection Angle, and the FHWA Every Day Counts: Intersection & Interchange Geometrics technologies.

If you have any questions or comments for the IJS, please reply to this email or make plans to attend our meeting next Tuesday evening!


Jeff Shaw and Brandon Nevers

IJS Co-Chairs

Evaluating Alternative Operations Strategies to Improve Travel Time Reliability

The following PREPUBLICATION DRAFT 2012  report is now out.  (

Among several strategies, access management is mentioned. So when explaining the usefulness of access management within your agency or to the public, consider mentioning this TRB – SHRP 2 report. (Strategic Highway Research Program).  I think the important issue here is that SHRP is linking reliability to access management. While we (friends of access management) have certainly linked system preservation to AM, it is always good when other peer reviewed reports do the same.

The research and report was “sponsored by the Federal Highway Administration in cooperation with the American Association of State Highway and Transportation Officials. It was conducted in the second Strategic Highway Research Program, which is administered by the Transportation Research Board of the National Academies. The project that is the subject of this document was a part of the second Strategic Highway Research Program, conducted by the Transportation Research Board with the approval of the Governing Board of the National Research Council.

Evaluating Alternative Operations Strategies to Improve Travel Time Reliability

“TRB’s second Strategic Highway Research Program (SHRP 2) Reliability Project L11 has released a prepublication, non-edited draft version a report titled Evaluating Alternative Operations Strategies to Improve Travel Time Reliability. The report identifies and evaluates strategies and tactics intended to satisfy users’ travel-time reliability requirements of roadways.”

report pages 64, 74, 75, 89 and appendix page F-8, and others if you do a word search.

Posted by

Philip Demosthenes
Denver, Colorado

Sneak Peek (NOT)

(This site is temporarily broken – look for a new site following the 2013 TRB Annual Conference) For a preliminary look at the new website, check out this unpublished link to Florida’s latest Introduction to Access Management.

This site is still under development, so forgive the lack of graphics and incomplete  items in some areas. The right sidebar is a work in progress, and may not be shown on all pages, and will contain different items that presently shown.

The home page structure is not set.

Note that under Categories (to be changed to Document Type) you can select on a document type and see what is (currently) available on the site.

Please comment below.

2nd International Conference

The second International conference on Access Management will be held in Shanghai China September 25-27, 2014. These conferences are an opportunity to get the latest information on access management and to share experiences and advice with others involved in access management. 

Our goal 
To promote the knowledge of AM for Asia
To educate the Chinese officials to apply AM technology in highway (re-)construction and management
To improve AM theory by validating AM in China
To broaden the influence of AM committee
To make very participant enjoy the life in Shanghai


Paper submissions are now open!

Colorado DOT 1977

Friends at Colorado DOT were just remembering that it has been 37 years since the Colorado Highway Commission adopted its first official access management policy in 1977.

It was in response to the need to increase the business and residential density of the City of Denver and find system management strategies to handle the growing traffic with limited urban rights of way for widening. Knowing that growing and serious congestion in the City would lend support to sprawling secondary suburban office centers that could promise less traffic congestion. The central business district needed to remain viable and vibrant both days and nights. Capacity into the CBD needed to be preserved.

Some of the material to create Commission Policy Directive 701 came from a series of research reports produced by the FHWA in 1976.  Technical Guidelines for the Control of Direct Access To Arterial Highways. The 1977 Policy Directive lead to new legislation in 1979 and new regulations in 1981.

Access management is a key component of arterial performance which is a key element in successful economic development.

Phil Demosthenes –  303-349-9497

“It is not the wealth of a nation that builds roads, but the roads that build the wealth of a nation.” President John F. Kennedy

P 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:

Hardcopies can be ordered here.

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

P Modeling and Evaluating Safety Impacts of Access Management Features in the Las Vegas, Nevada, Valley

This paper presents results of a study that developed statistical models that relate access management (AM) features to traffic safety in midblock sections of street segments. The objective of the study was to evaluate and quantify the impact of the AM features on traffic crashes in the midblock sections. Models were calibrated for two main types of median treatments for street segments: raised medians (RM) and two-way left-turn lanes (TWLTL). Other AM features considered were signal spacing and the densities of driveways, median openings, and unsignalized crossroads. Separate models were developed to determine the impact on total crash rates and types and severity of crashes. The study results confirmed the intuitive expectation that these AM features do have a significant impact on safety. They show that the crash rate of segments with RM was lower by 23% as compared with segments with TWLTL. The results also showed that higher densities of driveways, unsignalized crossroads, and median openings resulted in higher crash rates and severity. For example, for segments with RM, each additional median opening per mile resulted in a 4.7% increase in the total crash rate. These results are compared with the results of previous similar studies. It is anticipated that the results of this study will assist local jurisdictions in the Las Vegas, Nevada, Valley in developing new AM policies and programs.
Timur Mauga1, Mohamed Kaseko1study will assist local jurisdictions in the Las Vegas, Nevada, Valley in developing new AM policies and programs.

1Department of Civil and Environmental Engineering and Transportation Research Center (TRC), University of Nevada, Las Vegas, 4505 Maryland Parkway, Las Vegas, NV 89154-4007