The Federal Highway Administration says there aren't enough parking spaces in highway rest areas for truckers in 35 states, including Virginia.
The federal study found that in many cases, drivers can use private truck stops instead, but 12 states don't have enough room at the commercial facilities either.
The report recommended that states expand the rest areas and work with the private sector to expand both travel plazas and truck stops, and to allow truckers to stay in rest areas beyond the allotted time if the drivers need sleep.
The transportation department says that about 800 people a year die in truck crashes where driver fatigue is a factor. The study says Virginia is among the 23 states that don't have enough public spaces, but private spaces fill the gap.