The Federal Highway Administration has begun posting Highway Statistics for 2017. Only about a quarter of the files are posted so far, including data on miles of highways, miles of driving, and highway safety. Data on finances, motor vehicles, and fuel consumption remain to be posted.
Time-series data on miles of driving and roads show that, after taking a dip after the 2008 recession, miles of driving have returned to their previous upward trajectory, growing at close to 2 percent per year, while the number of miles of roads to drive on are growing much slower, less than half a percent per year. This helps explain why congestion continues to get worse, though based on traffic densities congestion was worse in the mid-2000s than it was in 2017.
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