KANSAS CITY, Mo. - As a father, Mike Horn has changed more than a few flat tires on his daughter's car.
"She just called me and said, 'Daddy, I have a flat,'" Horn said, "I don't know if she hit something or what."
Horn has given his daughter advice on how to avoid them.
"Uneven wear, how much tread i have on there, if there is anything out of the ordinary," he said.
On Wednesday afternoon on Westbound 435 near 103rd street, an SUV carrying nine people rolled over and off the road.
Investigators say the tire tread may have been the cause.
"It smelled like a firecracker," said 8-year-old India Page, who was in the SUV when it rolled over.
Tread on the SUV's tire separated, rolling the vehicle as the driver could not maintain control. The accident ended up injuring seven children and two adults.
A bad tire that needed replacing may have caused the accident. James Vaughn of Otto service showed us how this could have happened.
"You can see where it's starting to separate here. The fronts wear out faster because they're doing the turning," Vaughn said.
Vaughn always explains to his customers their tire road maintenance responsibilities.
"These here are the wear bars. This is to let you know how far you can run it down before you need to replace the tires," he said.
That is just one tread test that could easily keep you off the side of the road.