Update: 3 p.m.
Police have identifed the driver of the truck as Gary L. Lawson, 56, of Surgoinsville.
Update: 1:36 p.m.
Kingsport police say the overturned dump truck that closed Moreland Drive should be cleared from the scene by approximately 3 p.m., while the driver is in serious but stable condition at a local hospital.
The single vehicle crash occurred shortly before 12:30 p.m. Friday near the underpass at John B. Dennis Highway.
KPD Officer Dustin Jackson said the Vic Davis Construction vehicle was transporting coal ash when the driver lost control on a downhill grade and exited the right side of the roadway. It then struck a guardrail and overturned, closing both lanes of traffic.
The driver was transported to Holston Valley Medical Center by Sullivan County EMS. Officer Jackson said an investigation is continuing with charges pending.
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Shortly after noon a dump truck overturned on Moreland Drive, closing both lanes of traffic near the underpass at John B. Dennis Highway.
Kingsport police at the scene warn that cleanup could take a considerable amount of time.
Motorists in the area are urged to take alternate routes.