Are advertising messages allowed on lighted sign boards in work zones?

Advertising messages are not permitted on lighted sign boards in work zones because these signs are primarily intended for traffic control and safety purposes. Their main function is to convey essential information to drivers regarding construction activities, lane closures, detours, or other safety alerts. When advertising is included, it can distract drivers and detract from the clarity and urgency of the critical information needed to navigate safely through the work zone. The integrity of traffic control devices is paramount to ensure public safety, and any non-essential content, such as advertisements, undermines that objective.