[1] Illinois 134 is called Big Hollow Road in Fox Lake.

In Round Lake, it is called Round Lake Road west of downtown, and Main Street east of downtown.

After its terminus, Big Hollow Road continues further west for an additional 5.8 miles under county control first as Lake County Highway A26.

SBI Route 134 originally ran from Paris to the Indiana state line on what is now U.S. Route 150.

The entire route is in Lake County.