TRB Access Management AHB70

Increasing the awareness and use of Access Management

Category Archives: Effects

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

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.

Safe Access is Good for Business

FHWA Primer

FHWA Primer

This primer will address questions you may have about access management and its effect on business activity and the local economy. It focuses on economic concerns that may arise in response to proposed access changes or policies, including potential impacts on business activity, freight and deliveries, parking for customers, and property or resale value of affected property.

View YouTube video on-line  | Read primer

Economic Impacts of Access Management

Kristine M. Williams, AICP, Center for Urban Transportation Research, University of South

Florida, Tampa, January 28, 2000

Economic Impacts of Access Management – (33 KB) pdf

A growing number of state and local transportation agencies are adopting regulations aimed at managing driveway access and incorporating raised medians into roadway projects in urban areas. The purpose of these actions is to reduce traffic conflicts, protect driver safety, and improve traffic flow on major roadways. Yet introducing a median or regulating driveway access on an existing roadway is often controversial. In particular, owners of abutting businesses often feel that their business will be adversely affected. Below is a synthesis of recent research on the economic impacts of access management to assist transportation agencies in responding to public questions and concerns.

Importance of Access Management

With fewer new arterial roadways being built, the need for effective systems management strategies is greater than ever before. Access management is particularly attractive as it offers a variety of benefits to a broad range of stakeholders. By managing roadway access, government agencies can increase public safety, extend the life of major roadways, reduce traffic congestion, support alternative transportation modes, and even improve the appearance and quality of the built environment.

Without access management, the function and character of major roadway corridors can deteriorate rapidly. Failure to manage access is associated with the following adverse social, economic, and environmental impacts:

  • An increase in vehicular crashes,
  • More collisions involving pedestrians and cyclists,
  • Accelerated reduction in roadway efficiency,
  • Unsightly commercial strip development,
  • Degradation of scenic landscapes,
  • More cut-through traffic in residential areas due to
    overburdened arterials,
  • Homes and businesses adversely impacted by a continuous
    cycle of widening roads, and
  • Increased commute times, fuel consumption, and vehicular
    emissions as numerous driveways and traffic signals intensify congestion and
    delays along major roads.

Not only is this costly for government agencies and the public, but it also adversely affects corridor businesses. Closely spaced and poorly designed driveways make it more difficult for customers to enter and exit businesses safely. Access to corner businesses may be blocked by queuing traffic. Customers begin to patronize businesses with safer, more convenient access and avoid businesses in areas of poor access design. Gradually the older developed areas begin to deteriorate due to access and aesthetic problems, and investment moves to newer better-managed corridors.

After access problems have been created, they are difficult to solve. Reconstructing an arterial roadway is costly and disruptive to the public and abutting homes and businesses. The shallow property depth, multiple owners, and right-of-way limitations common to older corridors generally preclude ffective redesign of access and site circulation. In some cases, a new arterial or bypass must be built to replace the functionally obsolescent roadway, and the process begins again in a new location. Access management programs can help stop this cycle of functional obsolescence, thereby protecting both the public and private investment in major roadway corridors.

2010 Access Management Workshop Part 1

Kristine Williams
Oct 10, 2010 | 2010 Access Management Conference: Natchez, Missisisippi

Kristine Williams View presentation

This workshop will provide in-depth training for planners and engineers on the topic of roadway access management. Workshop content is derived from the Transportation Research Board Access Management Manual as well as short course training materials used for the Access Management Manual Workshop at the 2005 APA Conference in San Francisco (updated in 2009), the National Highway Institute Short Course on Access Location and Design (updated in 2009), and the FDOT Corridor Access Management Short Course. It is divided into two parts. It will address the principles and practice of access management, access management techniques, access permitting and regulation, and access management in planning and project development.

Access Management Principles

View animated principles

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. See this animation to learn more about the 10 principles of access management