Bjarni wrote:red is reserved as the "breakdown colour", so we will not use that one
Uhh, I didn't want red

It was only an example how it is with broken vehicles.
You have a new string - "Broken down!", which is in red.
I would like a new string "Heading for...", which could be in any colour; orange is fine.
Why like this?
Because:
1. Using the same string, only different colours = newbies, and all people "learning" the feature will have to guess and observe
which colour means what. It isn't obvious, that "Heading for.." in orange is for servicing, and in blue is for stopping in the depot.
2. Using different strings, but in the same colour = with this option, everybody will know for sure, 120%, what the vehicle is doing, without the need to guess. But strings alone
are not visible enough.
Imagine the "Broken down!" text in blue. I wonder how many people would miss broken vehicles thanks to this...
3.
Using different strings AND different colours = best of both - clear, inrofmative and very visible!
-=-=-=-=-
And the ultimate thought - which string I would like to colorize.
The answer is obvious: "Heading for..."
Why? Because servicing is a normal action, and vehicles are services sooo often. So it shouldn't be seen as something special. And the blue string means - "I'm following my route, I'm carrying stuff, everything is OK, don't worry, I just need a little service at the depot!"
On the other hand, "Heading for..." would be something unusual, different: "Somebody forced me to go to the depot and stay there! Hey! What's going on?".
This is how I see it.