USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation
Turner-Fairbank logo
OFFICE OF RESEARCH, DEVELOPMENT, AND TECHNOLOGY AT THE TURNER-FAIRBANK HIGHWAY RESEARCH CENTER

Safety Comparisons Between Interchange Types

Project Information

Project ID:
FHWA-PROJ-20-0054
Project Abstract:

When traffic and other conditions in an area warrant inserting a new interchange, or modifying an existing interchange, an Interchange Access Request (IAR) is required to justify the need. The IAR includes justifications from safety, operational, and engineering criteria. Although the number of IARs submitted for review annually amounts to the hundreds, the interchange types frequently proposed in these IARs is actually small. It is estimated that over 75 percent of all the IARs involve the construction/replacement/modification of just a few interchange types, such as a diamond interchange, a parclo-A/B Interchange, a single-point-urban interchange, a diverging diamond interchange, and so on. Rather than treating each IAR as a full-blown review, it is desirable to have a set of tools and a process in place that contain enough knowledge and expertise from reviews of similar interchange types to help streamline the IAR reviews.

The objective of this task order is to develop a planning-level safety assessment tool and interchange safety comparison process for use by the Federal Highway Administration (FHWA) and States Department of Transportation (DOT) staff in reviewing IARs, and to enable them to confidently assess (quantify) the safety performance of proposed design(s) against base conditions.

 

Project Status:
Completed
Project Funding Amount (Contract Award Amount):
$373,862.00
Start Date:
End Date:
Public Access Plan:
Yes
Grant/Contract ID:
  • 693JJ320F000414
FHWA Program Area:
  • Safety
Fiscal Year / AMRP Program / AMRP Activity:
  • FY 2002-2022 / Safety / Safety Design and Operations

AMRP = Annual Modal Research Plan

Contact Information

First Name:
Wei
Last Name:
Zhang
Phone Number:
(202) 493-3317
Email Address:
wei.zhang@dot.gov

Management Organizations

Sponsor Organization

Organization Role:
Sponsor Organization
Organization:
Federal Highway Administration: Office of Research, Development and Technology - Office of Safety and Operations Research and Development

Performing Organization

Organization Role:
Performing Organization
Organization:
Vanasse Hangen Brustlin, Inc.