The Simpsons Hit and Run: Most NPCs Plantworkers.

In The Simpsons Hit and Run, there is a glitch to make most NPCs Plant workers.

How to do
You'll require the press horn to jump cheat. I don't know if you can do it with cars other than the R/C Buggy. Well, go to Level 1 and go to the Power Plant. In your car, Use the Horn to jump through the walls. DO NOT PRESS SELECT YET! When you're away from the Power Plant and Mr. Burns's Mansion, press Select. You should be sent to the road. Everything is normal BUT most NPCS are Plant workers.