What does a traffic control plan usually include?

Answer: C — Sign placements and flow of traffic

A traffic control plan is a crucial document used in work zones to ensure the safety of both workers and motorists. It provides a detailed layout of how traffic will be managed around the work site. This plan typically includes specific information on sign placements, which are critical for alerting drivers to the presence of construction work and any necessary detours or changes in traffic patterns. Additionally, the flow of traffic is meticulously outlined to create a safe and efficient path for both vehicles and pedestrians, minimizing disruptions caused by the work activities. The other options do touch upon relevant aspects of project management but do not directly pertain to the primary purpose of a traffic control plan. For instance, while material costs and employee schedules are important for overall project implementation, they do not provide the traffic management details needed for safely navigating a work zone. Project timelines might help establish when work will occur but do not focus on how to control and direct traffic during those times. Thus, the inclusion of sign placements and flow of traffic is what makes a traffic control plan essential for maintaining safety and efficiency in work zones.