Table 4-52: Highway Noise Barrier Construction (Miles)

Table 4-52: Highway Noise Barrier Construction (Miles)

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  Unknown 1963-80 1981-89 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 Total 1963-2001
TOTAL length 6 224 531 R64 R99 142 R88 89 R129 R54 R88 R129 51 76 69 1,831
Type I barriersa d6 144 380 44 78 R114 R63 R47 R90 R37 R55 R105 30 62 40 1,293
Type II barriersb 0 78 120 19 18 18 R21 16 32 15 31 R23 17 10 10 429
All other typesc N 2 31 R1 R3 R10 R4 R26 R7 R2 R2 1 4 4 19 108
Cost (2001 $ millions) N 187 716 101 165 213 135 127 181 75 140 205 97 124 98 2,564

KEY: N = data do not exist; 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.

NOTES

Twenty-eight miles of barriers, while assigned a year of construction, cannot be assigned a cost. Data are produced on a 3-year cycle.

California and Arizona did not provide data for the years 1999, 2000, and 2001 and therefore these years may not be comparable with previous years.

SOURCE

U.S. Department of Transportation, Federal Highway Administration, Office of Environment and Planning, Highway Traffic Noise Barrier Construction Trends (Washington, DC: 2003), tables 1 and 3.