All BTS releases, except the Transportation Services Index, will be delayed.
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Warning Devices at Public Highway-Rail Grade Crossings
KEY: HWTS = highway traffic signals; WW = wigwags.
U.S. Department of Transportation, Federal Railroad Administration, Railroad Safety Statistics Preliminary Annual Report, table 9-4, available at safetydata.fra.dot.gov/OfficeofSafety/publicsite/Prelim.aspx as of July 2015.