When you make a left at the light coming off either exit (N or S parkway exit 137) cop cars will be parked across from the lights hidden in parking lots of the industrial type buildings. I have also seen a cop car parked on the center median of Westfield Ave./North Ave. as you’re making a left off the exit. Also I’ve seen a cop car parked in the Shell gas station (as previously mentioned) I live in Roselle Park so I’ve seen the above locations of cop cars often at night. Sometimes Cranford police will even park at the top of Grove street (last street in RP so they can get you as you go into Cranford) Make sure you’re doing the speed limit as you come off exit 137 at night (35) By the time you see them they’ve already seen you!