What type of warning signs should be placed around a work zone?

The correct choice emphasizes the need for safety and awareness in a work zone where roadway workers are present. Signs indicating the presence of workers and the need for caution serve a crucial purpose: they alert motorists and other personnel in the area to the potential hazards associated with construction or maintenance activities. These warning signs help to ensure that drivers slow down, stay alert, and take necessary precautions to protect both themselves and the workers involved. Safety is the primary concern in any work zone, and effective communication through appropriate signage is a key element in achieving that safety.

In contrast, signage that promotes local businesses, displays train schedules, or indicates road closures does not specifically address the immediate safety concerns of a work zone. While those signs serve other effective purposes in their contexts, they do not provide the necessary warnings that are critical for protecting the well-being of roadway workers and the public during active work procedures.