Cedar Rapids Police Chief Greg Graham says six officers have been issued letters of discipline because they didn't have their patrol car's lights and sirens operating when they were speeding to a call.
He says five were not violations and that the remaining 15 instances are under review.
Cedar Rapids police also have notified Marion police and the Linn County sheriff's office of possible violations by their personnel, and are investigating infractions by city buses and a garbage truck.
Marion Police Chief Harry Daugherty says the authorities must be "consistent and show no favoritism."
