Howard County police closed the southbound lane of Snowden River Parkway for almost six hours yesterday after a tanker truck overturned, spilling about 7,000 gallons of liquid nitrogen.
The truck was carrying the refrigeration liquid when it overturned about 9 a.m. near Route 175, rupturing the tank, said Howard County fire department spokesman William Mould.
Mould said the driver might have turned too quickly and caused his load to shift. The driver, who was not identified, suffered minor injuries. No charges were filed, and Mould said police are continuing to investigate the accident.
Hazardous-materials crews righted the truck about 2 p.m., and it was towed from the road. Crews then cleaned the road, which was reopened about 3 p.m.