City will rebuild subdivision roundabout

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Friday, May 28, 2010
— The city is redoing a roundabout after wet weather damaged the roadbed and heavy equipment damaged the asphalt.

The roundabout at Sandhill and Sandstone drives was installed about three years ago and before the homes in the new subdivision were built.

Installing a roundabout in a low-volume traffic area was former public work director Jack Messer’s way of getting Janesville residents accustomed to the traffic-control method.

He believed roundabouts would be successful in fairly low-volume locations where the traffic increases as development grows.

Two factors—a wet season and an inordinate amount of heavy equipment—contributed to the pavement failure at the Sandhill roundabout, Mike Payne, engineering manager, said.

The crushed limestone roadbed probably never dried before the city was forced to pave for the winter, Payne said.

In addition, Janesville traditionally paves with an initial layer of asphalt and three years later follows with a second. That allows for home construction activities, Payne said. The city can pave over damage caused by heavy trucks as homes are being built. The three-year interval allows the asphalt to settle.

But the developer—Petry Development, Loves Park, Ill.—built several dozen spec homes at the same time, Payne said. As the heavy equipment circled the roundabout, the tires shoved the asphalt to the outside of the circle and created unacceptable street conditions, Payne said.

Workers early this summer will patch the damaged roadbed. Concrete paving, rather than the more flexible asphalt, will be used to pave the roundabout, Payne said.

Concrete likely will be used for all future roundabouts, Payne said.

The council Monday approved a $167,983 bid from Rock Road for the project.

Last updated: 1:44 pm Thursday, December 13, 2012

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