Invert colour button on minimap

[ӔO]

When upgrading slow intercity roads and rails to faster ones, I find it difficult to find the slow lines, because the colours are dark and do not contrast well on the minimap.

Being able to invert colours, so that fast uses dark and slow uses bright, would help greatly in finding these slower routes.


Some of the other minimap filters could also benefit from being able to invert colours.