red color is have more visible sense. we see the light red color in much more distance compare to the other lights. Also red color will not affect or invisible due to some natural causes like rain, storm, dust, mist, etc.
After stopping, you may turn right, unless prohibited by some other sign or signal.
Yes
Emergency vehicles carry a transponder that transmits a radio signal to change the traffic lights to green for them.
A signal light that is not working.
Stop light is another name for a traffic signal.
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.
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.
Railway signal
To any vehicle already in the intersection, to pedestrians, and to emergency vehicles with emergency equipment operating.
If you are blocking traffic flow for a long time then yes.
You must stop
The light reduces the chance of an accident, causing the traffic congestion to go down the most during rush hour.