Table 4-52. Highway Noise Barrier Construction (Miles)
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| Type I barriersa
|
6d
|
102 |
419 |
44 |
87 |
34 |
47 |
114 |
1,146 |
| Type II barriersb
|
0 |
70 |
128 |
19 |
32 |
15 |
31 |
22 |
391 |
| All other typesc
|
N |
2 |
28 |
0 |
6 |
0 |
1 |
1 |
79 |
| Total length |
6 |
175 |
575 |
63 |
125 |
49 |
78 |
137 |
1,623 |
| Cost (1998 $ millions) |
N |
134 |
656 |
89 |
152 |
60 |
111 |
169 |
1,931 |
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.
KEY: N = data do not exist; R = revised.
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.
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