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Highway 97 "speed bumps" are caused by Mother Nature


STRATFORD, Wis. (WSAU) -- Motorists between Stratford and Marshfield have been complaining about what appears to be speed bumps. Department of Transportation spokesman Brent Matthews says the annoying bumps were not installed, but are a product of warm weather.  “Those bumps are actually the pavement pushing up into the asphalt, typically caused by warm temperatures, and we’ve seen some of those pop up over the last couple of weeks, due to the warmer temperatures that we’ve had.”

Normally, highway crews deal with pavement buckling on concrete roads. He says that stretch of Highway 97 has blacktop on top of old concrete.  “The old pavement, the concrete tends to buckle, and it’s something similar to what you would see on a regular concrete roadway where they buckle, however, there’s asphalt over the top of the concrete, so kind of what that concrete does is it will push up on that asphalt and make a little bump.”

It may be annoying to drive over the bumps, which have forced some drivers to slow down to under 20 miles per hour, but there’s not much they can do about it right now.  “We’ll kind of wait until the warm temperatures are done, and then we’ll come through with the county and have them mill them off, just basically grind them off and smooth it out, and typically, that will take care of the issue for the future.”

There is no timeline for sending maintenance crews out to grind off the pavement problems, so Matthews is not sure when the road can be repaired.