Zahn, owner of Renu Auto Body in Madison, noticed a police speed trap on Fish Hatchery Road on Tuesday and decided he didn’t much like the concept.

So he wrote “Speed Trap Ahead” on a large piece of cardboard and positioned himself on a nearby sidewalk.

Within 15 minutes, Madison police officers booted him. “They told me it was city property and that I couldn’t hold that sign there.”

Zahn, who said he’s never been caught by a speed trap, doesn’t understand why officers didn’t welcome his help.

“You should have seen how people slowed down when they saw my sign,” he said. “(The police) say they’re out to slow people down, but you can’t tell me it’s not about the money.”