KERR COUNTY, Texas -

An overturned tanker caused some traffic troubles out in the Hill Country.

The accident happened at 8:15 a.m. on Interstate 10 near Mountain Home in Kerr County.

Investigators believe the driver fell asleep at the wheel and drifted into the median, causing the truck to flip onto its side.

The driver was taken to University Hospital in stable condition.

Meanwhile, crews were left with a big mess to clean.

The cab of the truck was leaking fuel and the trailer, filled with crude oil, was cracked in several places.

Crews were able to get the leaks under control so the spill was minimal.

However, it was a time-consuming clean-up process.

Crews first had to drain the oil from the overturned 18-wheeler and transfer it to another truck before they could get the rig into a position to tow it.

After that, environmental crews had to clean the scene.

The accident shut down both lanes of traffic on I-10 eastbound at Midway Road and one of the eastbound lanes.

There were no traffic backups but crews expected it would take about eight hours total to remove the truck and re-open the highway.