What general function does the concept of 'home signal' serve in transit systems?

The concept of 'home signal' serves a critical function in transit systems by controlling train entry into specific tracks. Home signals are typically positioned at the beginning of a track section and indicate whether a train may proceed onto that segment of track. These signals help manage train movements, ensuring safe and efficient operation within stations, junctions, and other complex areas of a rail network.

By signaling to the train operator if it is safe to enter the track, home signals help prevent accidents and signal conflicts, facilitating organized and timely train operations. This is essential for maintaining the flow of train traffic and ensuring the safety of passengers and crew alike. The other options, while related to various aspects of rail operations, do not directly pertain to the primary purpose of home signals. For instance, maximum speed limits and worker safety zones are important but serve different operational needs and functions within the transit system.