The U.S. Federal Highway Administration has released the latest issue of Traffic Volume Trends, a monthly report based on hourly traffic count data reported by the states. According to the report, travel on all roads and streets decreased by 1.9 percent in May 2011 as compared with May 2010. Cumulative travel for 2011 is down by 1.0 percent. The comparison of May 2011 with May 2010 shows a greater decrease in regions in the North-Central, South-Gulf and West than in the North-East and South-Atlantic.
Change in Traffic as compared to same month last year.
| Region | Total Travel | Percentage Change |
| North-East | 37.9 | -1.2 |
| South-Atlantic | 55.2 | -1.5 |
| North-Central | 58.3 | -2.1 |
| South-Gulf | 49.0 | -2.2 |
| West | 53.7 | -2.4 |