Update 1:30 p.m. -- The frontage roads are now open.
Update -- The northbound lanes of Interstate-35 are now open, but the frontage roads will remain closed for the time being, according to APD.
Earlier -- An 18-wheeler carrying 9,500 gallons of fuel flipped over on Interestate-35 Thursday morning, shutting down the northbound lanes and frontage roads of the interstate, just south of Slaughter.
The Austin Fire Department is on scene dealing with the hazmat situation.
They have stopped the flow of fuel that was running down the median and will load the fuel to another trailer.
"The biggest issue is when you have fuel on the ground, or if it's open, it's going to put off fumes. Eventually, the flammable fuels are going to subside somewhat,” Lt. Josh Portie with AFD said. “But, if we have any wind shifts, a vehicle driving by could potentially become an ignition source for the fuel that's on the ground."
Toll ways are waiving fees for the morning, and no injuries have been reported.
YNN's Traffic Reporter Joe Taylor says traffic is opening back up near the William Cannon exit.