Final answer:
High-Occupancy Vehicle (HOV) lane signs, which are designated for buses and carpooled vehicles. Such signs are part of larger traffic control and safety measures in place to facilitate efficient and safe transportation.
Step-by-step explanation:
These lanes are reserved for buses and vehicles with a driver and one or more passengers, as indicated by the specific sign posted. The goal of HOV lanes is to reduce traffic congestion and encourage carpooling. When interpreting such road signs, it is important to consider the local traffic laws and regulations as they can vary by region.
For instance, a route operating schedule can dictate the requirement for certain numbers of buses, like a one-hour one-way route that requires 4 buses per direction if it operates on a 15-minute schedule. Signage plays a critical role in areas like pedestrian safety, traffic management, and the protection of infrastructure, as indicated by other references to signs like the weight limit on a bridge or the necessity of a traffic signal at a busy intersection.