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

4.0 Geometric and Safety Design

4.2 Departure Zones

The departure zone of a conventional plaza is the area encountered by a driver upon exiting a toll lane. It includes the recovery zone, which is an non-tapered extension of the toll lanes downstream of the toll islands used for driver re-orientation and acceleration plus a departure transition area downstream of the recovery zone where the pavement narrows at a given taper from the conventional plaza width to the total width of the mainline or ramp (see the Terms & Definition Glossary). This can be more complicated with separate express toll lanes and often results in either no taper or a minimal taper on the side adjacent to the express lane and requires the transition pavement width to merge with the express lanes (typically on the mainline alignment) consistent with interchange design standards.

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