This is an old question that is no longer in use.
Images may be missing and the information may be dated.
Do all traffic signals have green, amber and red lights?
“Traffic signals” should be read as all signals found in the road sign category Traffic signals.
Examples of other types of traffic signals with red lights only:
Red flashing light (SIG16)
”Stop. A vehicle may not pass the stop line or, in the absence of such, the signal.”
There is also a driving licence book online (2023).
More examples of explanations: