When signs are not applicable, what should be done to them?

When signs are not applicable in a temporary traffic control zone, they should be covered or removed to minimize confusion and ensure safety for motorists and pedestrians. Leaving outdated or irrelevant signs can lead to misunderstandings about traffic rules or directions, potentially resulting in unsafe driving conditions. Covering or removing the signs helps to maintain clarity in the signage that is relevant to the current conditions of the work zone. This practice supports effective communication with road users and is crucial for the overall management of traffic flow and safety during construction or maintenance activities.