The soon-to-be diverging diamond configuration at Route 59 interchange with I-88 will cause ramp closures in August.
The diverging diamond configuration is designed to enhance traffic flow and safety on and off I-88.
Eastbound and westbound I-88 exit ramps to Route 59 will be closed, but I-88 entrance ramps from Route 59 will remain open. Traffic will be able to make a right onto I-88 in either location, but not a left turn.
Dates for the ramp closures have not been finalized but it will take place sometime after the first week of August.
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The ramps will be closed for a maximum of nine days, weather permitting, according to transportation officials.
“The closure will begin at midnight on a Friday night, Saturday morning and go until the Monday morning nine days later,” said Bill Novack, director of transportation and engineering for the city of Naperville.
According to Guy Tridgell, spokesman for the Illinois Department of Transportation, westbound I-88 traffic will use Winfield Road and Illinois 56 to reach Route 59, and eastbound traffic on I-88 will use Eola Road and Diehl Road to reach Route 59.
The closures will take place on the ramps, but through traffic on Route 59 will not be affected.
According to Tridgell, these closures are necessary to pour the concrete that will form the “X” in the diverging diamond interchange and install the extensive traffic signaling for this part of the project.
When closures are lifted, the interchange will be open.
“Once that is done, we can go to the traffic pattern that the diverging diamond supports, so that’s exciting,” Novack said.
The last major stage change on Route 59 will take place Wednesday. Southbound traffic on Route 59 from Ferry Road to Bruce Lane/Brookdale Road will be switched to new pavement, without reducing the number of open lanes.
The $85 million Route 59 expansion, which began in August 2013, includes reconstruction and widening of Route 59 from Ferry Road to Aurora Avenue/New York Street, as well as improvements at major intersections along those three miles.
According to Tridgell, the goal at this time is to have everything wrapped up around Labor Day, with three lanes of traffic in each direction. Work to the multipurpose path and sidewalks may extend later into the fall.