A truck carrying potatoes overturned on the Capital Beltway's outer loop Wednesday morning, closing several lanes of traffic during the morning rush.
The accident happened at about 2:30 a.m. near Forestville Road in Prince George's County.
Maryland State Police Cpl. Anthony Washington says the driver was flown to Shock Trauma in Baltimore with a significant arm injury.
Washington says investigators are looking at whether the driver fell asleep.
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All lanes are now open.
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