What each light means
Green. You may proceed, if the way is clear. Green is permission, never a guarantee: you still give way to anyone lawfully in the junction and to pedestrians already crossing. Amber. Stop. You may continue only if you are so close when it appears that stopping would be unsafe. Red. Stop, and do not pass the signal. Red and amber together, the signal is about to turn green. You must not move off yet. Until it does, this means exactly what red means. Flashing amber, the signal is not controlling the junction. Proceed with particular care, and follow whatever signs are posted.
