Not by my understanding, rule 288 implies two heads except as a dwarf in a yard or other slow speed situation.
Here is the thing, just because you put two heads on a mast, does not mean you have to actually light all the colors.
I have signals that have three aspects one of them never lights up.
Also, railroads often only installed two color heads where the third color would never be used.
I use type D signal heads (two or three vertical lights), a diverging route that is always speed restricted would only have yellow and red. The main route head above it would have green, yellow and red.
If the turnout is set for the diverging route and the detection is clear on the diverging route the signal will display red over yellow. This confirms both pieces of information, the turnout is set for the diverging route, and that route is clear of traffic.
A train ahead on the diverging route would set the signal red over red.
The top head would stay red any time the turnout is aligned to the diverging route. The bottom head would stay red any time the turnout is aligned to the main route.
Only the head for the selected route would respond to occupancy conditions ahead.
To explain my comment above about asects that never light, at a typical high speed interlocking a crossover would be protected by two heads in the direction of travel thru the crossover.
I do not use approach aspects at control point signals based on a train in the second block ahead - that is too far away to be of use to the operators, they are going to see two more signals before they get to the second block ahead.
So those are three aspect signals because they would be on the prototype, but they only show red over red, green over red, or red over green.
Here is the trap that you and others fall into - trying to match up the aspects you use to those “rule numbers”.
Your operators are not going to learn that stuff.
All