Nationwide, rest areas are closing because of flooding or budget shortfalls. On the other hand, one is being converted to truck parking.
For-hire freight transported in March increased 1.9 percent from February to the highest level since July 2008.
On-highway diesel fuel retail prices will average $3.89 a gallon this year and $3.93 in 2012, the U.S. Department of Energy forecast.
Compared to April 2010, the number of jobs in for-hire trucking was up 41,600, or 3.4 percent.
Surface transportation trade between the United States and Canada and Mexico rose 11.8 percent.
Manufacturing sector economic activity expanded in April, according to the Institute for Supply Management.
Data show 78 percent of commercial truck and bus drivers wore safety belts in 2010.
For-Hire Truck Tonnage Index rose 1.7 percent in March after falling a revised 2.7 percent in February.
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