Change display color for speed when over speed limit
Either enable a multi color speed as noted in suggestions with user enabled trigger for red or change the "over speed" color to yellow or orange. Having color vision issues the dark red against the black box is virtually unreadable. Yellow would be better as is is light color against dark color. The contrast for those with diminished color vision can be critical.
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Bob Powell commented
I agree with this suggestion. My thoughts were ( I think the same as the original poster). Below posted speed would be normal. I would then like to set a range (adjustable from 0 - 10 miles over) that would be green. Over that value would be red. That way we old guys don't need to try and see if we're only over by a few miles (I would set mine at about 5 over) because if the color is green, I'm good. As a GUI programmer, this should take but a few minutes of programming time. You already have the logic to identify the speed limit and current speed. Add a couple of variable based on each and you're there.