I use 'Alternative routes' option when choosing to navigate, which I find useful. I experienced an incident while driving recently, however, that led to a little confusion: the alternative route I had selected was yellow in colour that matched and overlaid the background road colour at one point but took a diversion from it so that I was viewing two yellow roads. It was distracting for a short while. I wonder whether it exists or might be possible in the future to change the colour of the selected route, to purple, say, to avoid such confusion?
I see the colours in Settings>Map customisation>MAP COLOURS/Other colours whose heading I had not seen previously. I am unaware of having been there ever. I do accept, however, that I can make my own choice.