Which of the following is NOT a purpose of construction and maintenance signs?

Construction and maintenance signs serve critical functions that enhance safety and efficiency on the roadway. Their primary purposes include notifying drivers of potential dangers associated with road work (such as sudden stops or detours), guiding traffic flow safely around work zones, and informing drivers about ongoing road work to prepare them for changes they might encounter.

Indicating parking spaces, however, is not a function of construction and maintenance signs. Parking space signage is part of a different category aimed at regulating parking areas rather than addressing safety and direction in active work zones. Therefore, the correct answer highlights that this specific function falls outside the scope of construction and maintenance sign purposes.