How are motor vehicles allowed to proceed at intersections with this type of signal light?

[LeVivian]

Green arrows indicate that vehicles are permitted to proceed in the direction pointed by the arrow; red arrows indicate that vehicles are prohibited from proceeding in the direction pointed by the arrow; yellow arrows indicate that the direction pointed by the arrow functions as a yellow light for vehicles. Additional knowledge about signal lights is as follows: 1. History: Traffic signal lights were invented by African American Garrett Morgan in 1923. Prior to this, railway traffic had already been using automatically switching light signals for some time. However, since trains operate on a fixed schedule in a single-file manner and stopping them is not easy, the signals used on railways only had one command: proceed. Road traffic signal lights are different; their primary responsibility is largely to instruct vehicle drivers to stop. 2. Types: These include traffic signal lights, traffic signs, traffic markings, and the directions of traffic police. The country implements a unified road traffic signal system.