Status of the Nation’s Highways, Bridges, and Transit:
2002 Conditions and Performance Report
Part I: Description of Current System
Part II: Investment Performance Analyses
Part III: Bridges
Part IV: Special Topics
Part V: Supplemental Analyses of System Components
The Interstate System is the highest-order functional system.
In 2000, it included 46,675 route miles. About 71 percent of these miles
were in rural areas, and 29 percent were in urban communities. Between
1993 and 2000, rural Interstate route miles grew by about 0.2 percent
annually, while urban Interstate route miles grew by about 0.6 percent
annually. The Interstate System included 55,679 bridges in 2000.
About 48.3 percent of NHS VMT is on pavement with "Good" ride quality, and 90.9 percent is on pavement with "Acceptable" ride quality versus 43.3 percent and 86.6 percent, respectively, for overall highway system. The number of NHS bridges rated deficient has decreased from 25.8 percent in 1996 to 21.5 percent in 2000 and the percentage of deck area of NHS bridges rated deficient has declined from 35.9 percent in 1996 to 30.8 percent in 2000.
Between 1997 and 2000, total daily vehicle miles of travel (DVMT) per lane-mile on the NHS increased by 7.8 percent. The rate of growth was greater in rural areas (8.9 percent) than in urban areas (6.8 percent).
An average annual investment of $47.4 billion would be sufficient to make all cost-beneficial highway improvements and eliminate the deficient bridge backlog on NHS roads. This amount is 55 percent above 2000 capital spending on the NHS.
The NHS share of the Cost to Maintain Highways and Bridges is $37.0 billion (49 percent), which is 21 percent above current funding levels. In 2000, capital spending on the NHS was $30.6 billion, or 47.3 percent of total capital outlay. The suggested NHS share of investment at the Cost to Maintain level would be larger (48.7 percent) than the current share, and would be smaller (44.4 percent) at the Cost to Improve level of expenditure.