The Montana Department of Transportation recently shared an officer’s dash cam footage, showing a allegedly drowsy truck driver drifting across the interstate.

According to Montana DOT, the officer pursued the truck after a “citizen complaint of a double trailer combination reportedly swerving among lanes.”

In the clip, a tractor trailer pulling double trailers can be seen moving erratically, before the officer turns on his sirens and attempts to pull it over.

After failing to pull over, the truck then drifts from the right lane into the left lane, then into a grassy median.

The truck makes it across the median and onto the roadway, briefly traveling in the wrong direction before coming to a stop.

The officer then drives across the median and pulls to a stop in front of the truck, blocking incoming traffic from striking the big rig.

The Montana Department of Transportation wrote the following on Facebook, in regards to the incident:

Recently one of MDT’s MCS Officers was instrumental in responding to a citizen complaint of a double trailer combination reportedly swerving among lanes. While attempting to initiate a stop, the truck left the roadway and without tipping, began travelling the wrong direction on the interstate. The video is an important reminder of the dangers of drowsy driving (for yourself and others on the road.) Always make sure you’re rested and alert behind the wheel!

Check out the officer’s dash cam footage below.