Table 4-52:  Highway Noise Barrier Construction (Miles),,,,,,,,,,,,,,,,,,,,,,,,,,
,Unknown,1963-1983,1984,1985,1986,1987,1988,1989,1990,1991,1992,1993,1994,1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,Total 1963-2004,,
TOTAL length,6,328,54,45,65,54,106,103,64,99,(R) 143,88,89,(R) 133,54,(R) 102,(R) 140,(R) 54,(R) 82,(R) 132,78,89,105,"2,205",,
Type I barriersa,d6,210,39,30,40,35,83,88,44,78,114,63,47,(R) 95,37,(R) 70,(R) 116,(R) 31,(R) 67,(R) 95,63,78,88,"1,613",,
Type II barriersb,0,114,14,14,24,16,8,8,19,18,18,21,16,32,15,31,23,(R) 18,(R) 11,(R) 18,13,4,14,471,,
All other typesc,N,4,1,1,1,3,15,7,1,3,(R) 11,4,26,(R) 6,2,(R) 1,1,(R) 5,(R) 4,(R) 19,2,7,3,121,,
Cost (2004 $ millions),0,329,67,57,106,72,168,163,108,176,228,144,135,203,79,180,242,110,147,207,190,171,159,"3,442",,
KEY: N = data do not exist; R = revised.,,,,,,,,,,,,,,,,,,,,,,,,,,
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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.,,,,,,,,,,,,,,,,,,,,,,,,,,
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NOTES,,,,,,,,,,,,,,,,,,,,,,,,,,
"Forty-five miles of barriers, while assigned a year of construction, cannot be assigned a cost.  ",,,,,,,,,,,,,,,,,,,,,,,,,,
California did not provide data for the years 1999 - 2004 and therefore these years may not be comparable with previous years.  ,,,,,,,,,,,,,,,,,,,,,,,,,,
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SOURCE,,,,,,,,,,,,,,,,,,,,,,,,,,
"U.S. Department of Transportation, Federal Highway Administration, Office of Environment and Planning, Highway Traffic Noise Barrier Construction Trends (Washington, DC: May 2006), tables 1 and 3. ",,,,,,,,,,,,,,,,,,,,,,,,,,
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