You go inside that space that has the bouy and stay to the port-side of the bouy.
Keep the buoy on my port side
You are traveling upstream on a river at dusk. You see a buoy with the number 4 and a flashing red light. What should you do?
lp
A flashing amber light means approach the lock at a safe speed and under full control.
Keep the buoy on your starboard (right) side.
If they have a green flashing light on top of their car, then they are a Doctor, and have as much priority as a regular emergency vehicle.
When going upstream, a buoy with a number 5 and flashing green light indicates the presence of a dam ahead. The dam may be used to generate hydroelectric power or to provide water for irrigation, and can pose a danger to boats and other vessels.
Cleared to cross
Green
unknown
Cleared to cross
A flashing green light on the AC switch of the 2001 Montero indicates there is a situation that requires attention within the cooling system. The issue could be as minor as a loose connection to an outright system failure.
They say that one way to determine whether is a green light is "stale" is by the flashing pedestrian "do not walk" sign. Not all intersections even have a walk or do not walk sign. Also, I have driven through intersections with flashing do not walk signs and the light remained green. The previous answer was a poor one.