For an aircraft on the ground, it means that you are cleared for taxi. For an aircraft in flight, you must return for landing or go around and attempt landing again.
Return to starting point
Clear the runway/taxyway immediately
cleared to taxi
No, Flashing your headlight's will have no effect on a traffic signal. The reason a traffic signal changes for emergency vehicles that have the lights flashing, is, they have a special transmitter that tells the light to change. This transmitter is connected to the emergency lights so it comes on when the lights are used.
This is called a "stale green" signal. It is about to change to amber. This is also recognized at some intersections by the flashing crosswalk signal informing pedestrians not to cross.
Exercise extreme caution.
Cleared to cross
Cleared to cross
An advanced green is a type of traffic light signal present in some jurisdictions in Canada, where the green light initially flashes while the matching light for oncoming traffic remains red, signalling to drivers that they may make an unobstructed turn across the oncoming lane while the flashing continues.
On a vertical display traffic signal the green light is on the bottom. On a horizontal display traffic signal it is to the right, but may depend on that state (or municipality's) practice.
This differs depending on the intersection. Some intersections are forever flashing red. Some intersections only turn green when there is a trigger such as a pressure-pad or a crossing signal.
Flashing RED: clear the active runway. Flashing RED AND GREEN: General Warning: Exercise extreme caution.
A flashing amber light means approach the lock at a safe speed and under full control.
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.
General Warning: Exercise extreme precautions