I took and interest into way finding by colour here are a few things i found.
The signs inside the hospital have a little colour block next to the name of the place, a lot like what i wanted for the entrance of our new build.
The one all in yellow was a bit over the top for me but a good thing was that it made it clear that you are on the right floor/department.
Finally and plan on Boston Road is all blocked out making it easier to read and direct yourself around.