Once upon a time, in the city of
In ‘standard’ system, green light means ‘go’, yellow light means ‘prepare to stop’, and red light means ‘stop’. In the non-standard system, however, flashing green light takes on the role of yellow light, while yellow light gives the same message as red light.
Actually, the Public Works Department can install two-set lights without the yellow lamp. That would lower the cost as well as reduce maintenance works. Isn’t that a brilliant idea?