Skip navigation to main content
United States Department of Transportation - Federal Highway Administration FHWA Homefeedback

4.0 Geometric and Safety Design

4.3.1 State-of-the-Practice

The Tables below present the project survey results related to express lanes configuration, and the type of barriers used on either side of the lanes. Note that almost all agencies have express lanes that are a continuation of the mainline or ramp roadway, rather than tapering to one side or the other. One variation to this configuration is the tapering of the express lanes to its ultimate location within the initial roadway median, the location where all future widening is planned to occur that will align the future widened lanes with the initial express lanes. This approach avoids the need for future expansion to the outside and the attendant changes to interchange ramp connections. Based on the survey results provided below, most agencies use concrete barriers on each side of the express lanes. .

Table of Contents | List of Tables | List of Figures | Previous Section | Next Section | HOME

FHWA Home | U.S. DOT | Operations Home | Privacy Policy
Federal Highway Administration - United States Department of Transportation