Iowa Code Title VIII. Transportation [Chs. 306-330B] § 321.397. Lamps on bicycles

Every bicycle shall be equipped with a lamp on the front exhibiting a white light, at the times specified in section 321.384, visible from a distance of at least three hundred feet to the front and with a lamp on the rear exhibiting a red light visible from a distance of three hundred feet to the rear; except that a red reflector may be used in lieu of a rear light. A peace officer riding a police bicycle is not required to use either front or rear lamps if duty so requires.