Traffic is backed up for miles due to a semi fire in North Dallas.
Dallas Fire-Rescue crews just extinguished the blaze on westbound Interstate 635 at Preston Road.
There are no reports of any injuries.
Two of the westbound lanes of I-635 are still blocked, with traffic backed up to U.S. Highway 75.
NBC 5 will update this story with more information as soon as it's available. As this story is developing, elements may change.