The reason is simple physics: Heat causes materials to expand.
When concrete slabs expand beyond the space in the joints they press against each other, causing the surface to buckle at the joint or in a weak spot within the slab.
Several cities reported highs in the mid- to upper-90s.
The heat took its toll on many roads. In Wisconsin, the southbound lane of Interstate 41 near Fond du Lac was shut down for about two hours after the concrete broke apart. And near Shawano, a portion of Hwy. 29 was rerouted for hours on Friday after a portion of the concrete buckled, damaging several vehicles.
In South Dakota, a similar situation was reported along Interstate 90 near Chamberlain.
Several cities have opened up cooling centers, including in Rock County, Wisconsin, and the Twin Cities metro area.
The DOT has a few tips when driving in hot weather:
- Slow down, buckle up and eliminate distractions, to focus your full attention on the road. Along with pavement buckling, other warm weather concerns can include animals or debris on the road.
- Watch for slowing traffic and be ready to move over for roadside workers, including highway crews repairing damaged pavement.
- Before taking that trip, check the 511 travel information system, either online at 511wi.gov or by phoning 511, for the latest update on any incidents or delays.
- If necessary, report serious pavement problems by calling 911, and provide specific location information.
