- It indicates that the flashing yellow light is about to appear. You should drive faster and clear the intersection immediately.
- It indicates that the flashing green light is about to appear. You should drive faster and clear the intersection immediately.
- It indicates that the red light is about to appear. You should prepare to stop or clear the intersection immediately.
- It indicates that the stable (not flashing) green light is about to appear and you would be able to continue driving.