like while driving? It may be illegal in your region but i just used a 4 pin relay to bypass the parking break wire

Its federally illegal to make it work while driving. Even though its really easy to get around.

why is it illegal while driving?

You have to ask that?

Yes, because i wonder why it is.

Because its considered a dangerous distraction. Some insurance companies wont pay for any damages if they find out its done, even if it wasnt on during said accident.

dont tell them you took drugs either
like everything is illegal while driving anyway.

I'm medical and always have it in my bloodstream.