From the McHenry County Department of Transportation:
These closures are to facilitate increasing the left turn lane length when headed southbound on Randall Rd. and turning eastbound onto Algonquin Rd.
This increase should allow those turning eastbound onto Algonquin Rd. to be staged in a designated turn lane, reducing the likelihood of those vehicles blocking the through lane.
These lane closures are anticipated to occur through Friday, December 7th.
As always, please travel through the work zone with caution! Thank you for your patience.