Naperville’s finest revenue raisers sit on Grommon and pick off many in the 30 MPH zone there (it goes from 40 to 30 from either direction). I see them there all the time, and it does’t take long for them to get someone. And, being Naperville, Once the lights are on, you are out $75 (no warnings, although the will gladly tell you how to apply for court supervision). And watch out for the motorcycle.