By the late 1980s, the U.S. highway network was near completion. Now, virtually all population centers are linked by paved roadways. The total number of lane-miles has been increasing as highways are widened with additional lanes to carry more vehicles; on the whole, capacity has been added to existing highways rather than building new ones.
Note: In 1997, forest development roads ceased being treated as public roads. This is why Figure 1-5 (above) indicates significant drops in both centerline and lane mileage in 1998.
Data Source: US Department of Transportation, Federal Highway Administration, Office of Highway Policy Information, Highway Statistics.
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