+1 for making street sign colors fit the current location.
It would be a really nice touch.
If the current country code is known to PureMaps, it would be really nifty to even auto switch colors if you pass borders
Albeit a settings option would suffice i guess.

One more thing, in landscape the instructions box on top covers much screen estate with its horizontal black box/bar.
I tend to switch off the box to have more map displayed.
The map however is not profiting from having that much width in landscape. There is not much usefull info on the far left and right of the map. Imo a square map is ideal for driving because it covers both cases.
1. Wanting to see what is left or right of your position in case of turning. And 2. having a decent far view when going straight.
Maybe in landscape have the instructions in a column on the left or right with 1/3 or 1/4 of screen width.
Or have you tried and discarded for some reason like character flow or too long words?