For 107, it has only the number itself due to the alternative rt
107x during sundays and PHs.
Now a days, most SBS new ADD services have just the no itself might
be due to its usefulness.
Imagine this, you see lets say 78, you might not be sure of the rt
even it says "Jurong East 78 Clementi (Loop)" as where it plys, so
you might ask the service captain after all or check the side plate
which is more comprehensive.