White and Light-blue, like the colours of the Argentine flag.
London Bridge doesn't have any support cables.
It is standard concrete color gray with white support cables and Sea Turtle friendly lights.
Officially steel but they are painted on a regular basis with red paint making them the same color as the rest of the cables on the bridge. Just google a picture to see for yourself.
The Golden Gate Bridge is famous because it is the tenth longest suspension bridge in the world.
They are red and white, or red and black for analog audio. Digital cables can be any color, as can HDMI cables.
Black
The bay bridge is a kind of gray/green.
London Dosent have a flag
red
Black.
Red.
The traditional (and original) color of the bridge was black. Now, for some reason, it is an ugly shade of blue.