Table 7
Type I and Type II Noise Barrier
Construction by Year
| Year | Type I Linear Length (miles) |
Type II Linear Length (miles) |
Type I (%) |
Type II (%) |
|---|---|---|---|---|
| 1963-1986 | 320 | 167 | 66% | 34% |
| 1987 | 35 | 16 | 69% | 31% |
| 1988 | 83 | 8 | 91% | 9% |
| 1989 | 88 | 8 | 92% | 8% |
| 1990 | 44 | 19 | 70% | 30% |
| 1991 | 78 | 18 | 81% | 19% |
| 1992 | 114 | 18 | 86% | 14% |
| 1993 | 63 | 21 | 75% | 25% |
| 1994 | 48 | 16 | 75% | 25% |
| 1995 | 95 | 32 | 75% | 25% |
| 1996 | 37 | 15 | 72% | 28% |
| 1997 | 70 | 31 | 69% | 31% |
| 1998 | 116 | 23 | 84% | 16% |
| 1999 | 31 | 18 | 63% | 37% |
| 2000 | 67 | 11 | 86% | 14% |
| 2001 | 96 | 18 | 84% | 16% |
| 2002 | 63 | 13 | 83% | 17% |
| 2003 | 81 | 4 | 95% | 5% |
| 2004 | 89 | 14 | 86% | 14% |
| 2005 | 55 | 10 | 84% | 16% |
| 2006 | 77 | 13 | 86% | 14% |
| 2007 | 52 | 17 | 75% | 25% |
| UnknownYear | 6 | 0 | 100% | 0% |
| All | 1,803 | 511 | 78% | 22% |
Total Types I and II - 2,313
Total All Other Types - 184
Total Types I and II Plus - 2,497
All Other Types
