From Chicago:

 I-90 W toward O'HARE/ROCKFORD (Portions toll) 69.1 mi
Take the STATE ST/US-20 BUSINESS exit.  0.5 mi
Take the ramp toward ROCKFORD.  0.1 mi
Turn SLIGHT RIGHT onto E STATE ST/US-20 BR.  0.8 mi
Turn RIGHT onto N PERRYVILLE RD/CR-11 N.  0.9 mi
Turn LEFT onto GUILFORD RD.  1.8 mi
Left turn into 5151 Guilford Rd Rockford, IL 61107-2410
  

From Wisconsin:

Merge onto I-39 S/I-90 E JANESVILLE/CHICAGO (Portions toll)  49.2 mi
Take I-39 S/I-90 E/US-51 S/JANE ADDAMS MEMORIAL TOLLWAY (Portions toll).  8.9 mi
Take the E. RIVERSIDE BLVD exit.  0.3 mi
Merge onto E RIVERSIDE BLVD/CR-55 toward MACHESNEY PARK/LOVES PARK.  0.8 mi
Turn LEFT onto N PERRYVILLE RD/CR-11 S.  2.5 mi
Turn RIGHT onto GUILFORD RD/CR-86.  1.8 mi
End at 5151 Guilford Rd Rockford, IL 61107-2410