SIOUX FALLS, S.D. (AP) — A portion of Interstate 229 in Sioux Falls has buckled due to extreme heat in the area.

The road buckled under the Western Avenue bridge, backing up traffic as crews worked to fix the problem and direct motorists. Drivers are being asked to slow down and use caution.

The temperature in Sioux Falls was 93 degrees with a heat index of 107 degrees when the buckle was reported Friday afternoon. The temperature reached 94 degrees with a heat index of 109 just a few hours later.