Idaho Code § 49-657: Work zone speed limits — Penalty.

(1) No person shall operate a vehicle in excess of the posted maximum speed limit established for a highway work zone when the work zone is designated by appropriately placed signs indicating: the work zone; the reduced speed limit; and notice of an enhanced penalty for exceeding the reduced speed limit.

(2) Violation of the provisions of this section shall be an infraction punishable by a fixed penalty of fifty dollars ($50.00).