...fully with you @jörgen - in the night, it's mostly better to use the dark mode. But it's hard to differentiate between the street types. And yes, sometimes to routeline is not easy to see.
By all my commitment about corporate colour design - especially with the dark mode, colour vision defects in (older) eyes become clearly apparent in this context!
Some support by an optic specialist in defining the color scheme would be helpful. Or a solution, users can define the colours for streets by themselves. More and more Navigation tools offers such a function...