"Web color report"
You can probably set it on a group.
I created a group and tried to add this and even adding the vehicles in that group they keep showing the blue lines, I insert the code #ff0000.
Then I'm not sure. Maybe it's not supported for a group.
When I want a device to show the trip report in red I have to add an attribute individually. I would like to know if there is any way to leave this in a single red color without having to add it individually. "Web color report"