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Highway Noise Barrier Construction
Miles of noise barriers can neither be assigned a year of construction nor a cost.
Miles of barriers, while assigned a year of construction, cannot be assigned a cost.
KEY: R = revised.
a A Type I barrier is built on a new highway project or a physically altered existing highway.
b A Type II barrier is built to abate noise along an existing highway (often referred to as retrofit abatement) and is not mandatory.
c All other types of barriers are nonfederally funded.
d Have not been assigned a year of construction or a cost.
U.S. Department of Transportation, Federal Highway Administration, Office of Planning, Environment, and Realty, Summary of Noise Barriers Constructed by December 31, 2013 (Washington, DC: May 2016), available at http://www.fhwa.dot.gov/environment/noise/noise_barriers/inventory/ as of June 2016.