In the San Francisco Bay Area, they require toll transponders, some having a switch saying whether you have one, two, or three or more occupants. I don’t know h

In the San Francisco Bay Area, they require toll transponders, some having a switch saying whether you have one, two, or three or more occupants. I don’t know how they would catch cheaters, if at all. Edit: Apparently the highway patrol is notified of carpools they should watch in passing.