The national price increased 2 cents to $2.919 in the latest week and is 39.1 cents higher than a year ago.
TransCore's North American Freight Index for June showed a 112 percent increase in spot market freight availability.
The two-year, limited exemption would apply to drivers transporting anhydrous ammonia in agricultural operations.
The national price dipped 0.4 cent to $2.899 in the latest week, the ninth week in the past 10 in which prices fell.
State Transporation Statistics consists of 112 tables of state data on infrastructure, safety and freight transportation.
State Road 9B project has been stalled since the mid-1970s.
ACT projects full-year production of Class 8 vehicles will be up 26 percent compared to 2009.
Massachusetts is the 29th state to ban texting behind the wheel.
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