The Iowa Dept. of Transportation released this footage as a warning for drivers to be aware of their surroundings.

In the clip, a truck is seen swerving off the road because it wasn’t able to stop in time as it approached stopped traffic. The traffic was caused due to an earlier accident.

The Iowa DOT wrote the following message on Facebook.

“Paying attention in traffic is critical! Secondary crashes are often caused when people aren’t aware of what is going on around them. This was the case this morning at the west mixmaster. The original fender bender happened when traffic slowed merging onto I-235. Thankfully the truck in the secondary crash did not make contact with the vehicles on the shoulder or with the occupants of those vehicles who were outside of the cars.”

“Secondary crashes are often more serious that the initial fender bender. Please pay attention!” they added on Twitter.