Progressive Route Fading Behind Vehicle

🚧 THIS IS A TICKET MIGRATED FROM UPVOTY. The original ticket and comments will be available for a limited time over at:
https://abrp.upvoty.com/b/request-a-feature/progressive-route-fading-behind-vehicle/
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Could we get progressive route fading so that it's easier to distinguish which part of a route you've already traveled on on convoluted route plans?