Damn advocacy groups anyhow.
Oh back to the main question, I think there is a law in the twin cites that says it's illegal to drive a red vehicle because it scares the horses. The law is still valid but not enforced.
A personal experience with a stupid law. Having a passenger on an ATV on private property in Iowa $42.00 fine.
EDIT: it's also against the law to chase fish with a fourwheeler in Iowa.