It was a scary sight in Wentzville -- school buses piled up and trauma patients everywhere.

Luckily, this was all a drill.

If you see something like this in the area, it's not a good sign. But after a long day of training, the crews inside are better prepared for a disaster.

After a series of tragedies involving school buses, St Charles County emergency departments decided to practice their response. Using dozens of dummies and several live volunteers they re-created a highway pileup involving cars and school buses. This training gets them in gear, but also makes the school districts think about what they should do.

"The name of the game today is cooperation, situations like this don't happen in a silos we have to come together to work on these scenarios because in a real situation that's what it's going to be," said St. Charles County ambulance district spokesperson, Kyle Gaines.

This scenario took months to set up and prepare.

This is something emergency teams do every year here. Last year they prepared for a mass shooter.