Grundy County Highway C37 is a connector route between I-55 and GCH V36. It starts at GCH V36 (Broadway Road), and heads east down Reed Road to the Will/Grundy County Line at Braidwood. GCH V36 does not pass through any towns in Grundy County. GCH C37 passes through the following township in Grundy County. Braceville GCH C37 intersects the following major roads in Grundy County. Grundy County Highway V36 (Broadway Road), south of Coal City. Interstate 55, near Braidwood. GCH C37 is not multi-plexed in Grundy County.