First I've heard of that. There are some colors (blue or red) that would come under the "bad idea" category, but I'm not sure why they'd be illegal.it is not legal in my state to drive around with underglow lights on
I had been fantasizing about a side-glow connected to turn signals, since on the Cruze, there's no way for someone who can't see the rear lights to see any turn signal indication. I'd also like a blinking underglow for the rear when backing up (think of a visual version of the backup beeper). I hadn't thought about any connection to the brake lights.