U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000

U.S. Department of Transportation/Federal Highway Administration

U.S. Department of Transportation/Federal Highway Administration

Bridges & Structures

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Ancillary Highway Structures

The image depicts an example of structural supports for signage on a controlled access highway.
Photo courtesy of GPI, Inc.

Documents

Ancillary Structures Inspection Reference Manual (ASIRM) (November, 2021)
Guidelines for the Installation, Inspection, Maintenance and Repair of Structural Supports for Highway Signs, Luminaires, and Traffic Signals (March, 2005) Archived

Training

NHI Course 130087 - Inspection and Maintenance of Ancillary Highway Structures

Photo source: FHWA

Updated: 10/27/2022

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