A four-car crash closed the southbound lanes of the Fairfax County Parkway at Sunrise Valley Drive for more than 60 minutes during Friday rush hour.
Police said they did not yet know whether weather was a factor in the crash. Roads around Reston were slippery Friday morning after several inches of snow fell in the area Thursday night.
Officers were on the scene from about 8:30 a.m. to 9:30 a.m., when all lanes were reopened.
Two people were reportedly taken to the hospital, but the injuries appeared non life threatening, police said.