What does traffic light B mean?

[OFaith]

Traffic light B refers to the traffic light used for Bus Rapid Transit (BRT), which is specifically designed for BRT systems. Its function is the same as regular traffic lights, generally consisting of red, green, and yellow lights. A red light indicates stop, a green light indicates permission to proceed, and a yellow light serves as a warning. Traffic light B is specifically for buses. When the B light turns green, buses can proceed along their designated route regardless of other lights. When the B light turns red, buses must stop and yield regardless of other lights. There are two types of traffic lights: those for motor vehicles, commonly referred to as vehicle traffic lights, typically composed of red, yellow, and green lights to direct traffic flow.