"The annual Reason Foundation study measures the condition and cost-effectiveness of state-owned roads in 11 categories, including deficient bridges, urban traffic congestion, fatality rates, pavement condition on urban and rural Interstates and on major rural roads, and the number of unsafe narrow rural lanes. National performance in all of those key areas improved in 2008, the most recent year with complete data available.
Drivers in California, Minnesota, Maryland, Michigan and Connecticut are stuck in the worst traffic. Over 65 percent of all urban Interstates are congested in each of those five states. But nationally, the percentage of urban Interstates that are congested fell below 50 percent for the first time since 2000, when congestion standards were revised."
The recession-related drop in driving has also decreased road fatalities, according to the report.