Table 4-52: Highway Noise Barrier Construction

Table 4-52: Highway Noise Barrier Construction

(Miles)

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  Unknown 1970-79 1980-89 1990 1991 1992 1993 1994 1995 1996 1997 1998 Total
1970-98
Type I barriersa d6 102 419 44 78 113 62 48 87 34 47 114 R1,147
Type II barriersb 0 70 128 19 18 18 22 16 32 15 31 22 391
All other typesc N 2 28 0 U U U U 6 0 1 1 79
Total length 6 175 575 63 96 131 84 64 125 49 78 137 1,623
Cost (1998 $ millions) N 134 656 89 144 186 118 112 152 60 111 169 1,931

KEY: N = data do not exist; R = revised.

a A Type I barrier is built on a highway project to construct a new highway or to physically alter an 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: Miles have been converted from kilometers.

Totals may not match the sum of yearly estimates due to rounding and converting from metric. 24 miles of barriers, while assigned a year of construction, cannot be assigned a cost. Data are produced on a 3-year cycle.

SOURCE: U.S. Department of Transportation, Federal Highway Administration, Office of Environment and Planning, HighwayTraffic Noise Barrier Construction Trends (Washington, DC: 2000), tables 1 and 3.