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If the aircraft is in flight, a steady green light signal from the control tower means cleared to land. If the aircraft is on the ground, it means cleared for takeoff. If the light is aimed at ground vehicles or foot traffic, steady green means cleared to cross the runway, or proceed.
clear for landing or takeoff.
A steady (instead of flashing) yellow light means the traffic signal is changing from green to red. You must stop if it's safe to do so. If you're already stopped you must not proceed.
A traffic light with a steady red light means stop. All traffic must come to a complete stop until the light turns green. It is illegal to proceed through an intersection with a steady red light.
Ground - Cleared for Takeoff. Air - Cleared to Land.
You get light green.
A red light - steady or flashing - means STOP. A steady amber light means Caution - signal about to change. A flashing amber light means SLOW DOWN.
A traffic signal displaying a steady circular green light means that, at least according to the light, you have the right to proceed. BUT, that also means "only if it is safe to do so". For example, a driver coming South is in the intersection, going straight, when the light changes. Traffic stops him from getting out of the intersection. You are traveling west and want to turn South. But his Range Rover is in the intersection! You have the green light! What you do is stay put, even if your light changes to red before you can move into your turn, even if everyone behind you gets mad at you. You must not clog up the intersection, because drivers coming East may want to turn North.
Because a green light has a light bulb behind green plastic.
steady amber
warm front
A green light on a traffic light set (in the UK) means automobile traffic is free to go. Walking out when commuter traffic lights are on green is a bad idea. Answer from @MunicipalSigns: In general: A steady GREEN traffic light means you can go through the intersection. You must yield to emergency vehicles and others as required by law. If you are stopped and then the light turns green, you must allow crossing traffic to clear the intersection before you go ahead. A GREEN arrow means you can safely turn in the direction of the arrow. There should be no on-coming or crossing traffic while the arrow is green. If you are turning left, a steady green traffic green light means you may turn but only when safe to do so. Oncoming traffic has the right-of-way. Be alert for signs that prohibit left turns. When turning right or left, watch for pedestrians crossing in front of your vehicle.