Noise Barriers Construction Trends

By Year


Year	Linear Length of Noise Barriers (Miles)	Actual Cost ($Millions)	2004 Cost ($Millions)
1963-1983	328	173	329
1984	54	40	67
1985	45	37	57
1986	65	70	106
1987	54	46	72
1988	106	116	168
1989	103	114	163
1990	64	76	108
1991	99	122	176
1992	143	155	228
1993	88	101	144
1994	89	101	135
1995	133	160	203
1996	54	62	79
1997	102	152	180
1998	140	199	242
1999	54	98	110
2000	82	138	147
2001	132	194	207
2002	78	182	190
2003	89	166	171
2004	105	159	159
Unknown	6	0	0
ALL	2,205	2,662	3,442

NOTE:
Miles of noise barriers that can neither be assigned a year of construction nor a cost - 6
Miles of barriers, while assigned a year of construction, cannot be assigned a cost - 45