One semi truck’s load of logs went crashing through another trucker’s windshield after an abrupt stop in Washington on Thursday morning, seriously injuring the driver.

The accident occurred on March 1st at around 9:45 a.m. in Tacoma, Washington.

Washington State Troopers say that the two big rigs, both hauling logs, were traveling along Interstate 5 north near the Highway 16 interchange when they approached a construction zone.

Once in the construction zone, the first semi truck came to a sudden stop for an unknown reason, forcing the second semi driver to slam on his brakes. The second truck was unable to stop in time and drove into the load of logs, causing it to penetrate his cab.

The unnamed driver of the second rig was transported to a nearby hospital with serious injuries, but has been listed in stable condition, reported KVAL News.

The exact reason for the sudden stop is still under investigation, and two lanes of northbound I-5 were shut down as crews worked to clear the debris. As of 10:30 a.m., the lanes were still closed with no estimated time for reopening, and officials are urging drivers to avoid the area.