infared
Stopped!
electromagnetic signal
Signal to driver’s behind
Left turn (a) yields to oncoming traffic (b). Without a stop sign or traffic signal, driver b has the right of way.
stop... A police officer assuming control of that intersection will have precedence over a traffic signal. If their signals are contrary to the traffic signal, you'll follow their signal.
Stop light is another name for a traffic signal.
traffic signal.
A signal light that is not working.
we control traffic by follows the signal
positive
traffic signal, sign etc
The answer will depend on what type of signal it is: acoustic, electromagnetic and in what medium the signal is propagated.