I would like to be able to put my small GPS on my dashboard and project it on my windshield. I know YANAL, depends on jurisdiction, member FDIC, if rash develops discontinue use, etc. but are there any obvious reasons why it would be illegal?
If not, expect a later post for some ideas about lenses for the distortion and brightness control.
Some GM models from the 90’s projected the digital speedometer onto the windshield in a manner like you’re thnking of. They seemed to be perfectly legal, but they sort of disappeared along with the digital speedometers. Also, they were kind of bluish, so I don’t think that’s an issue either.
My 2001 Bonneville had a HUD (digital readout, I hated it), and a traditional analogue speedometer. The only other digital junk was the climate control, clock, and stereo. I kind of miss the speedometer. I didn’t have the traditional miles/km rings. Instead, it had a button to switch the whole car from US to SI, and it was fun to make passengers think I was doing 130 miles per hour!
I had a Grand Prix that had the HUD for the speed, radio station, low fuel warning…maybe a couple other things. I thought I didn’t like it but sure missed it when I sold the can and had to look all the way down there to see how fast I’m going…
Our new Corvette has a HUD, and it’s essentially a reflected image up on the windscreen (although it works very well). It’s also not visible from outside the car, so the color really is irrelevant (and I doubt the red or blue light ordinances people are hinting at have any bearing; some Mustangs have red and orange instrument cluster lights which are far brighter than any HUD would be).
I was thinking of a plano convex lens to flip it and make it larger. Shaped like a fistrum of a cone should account for the varying distance to the windshield. A big question is how to make it brighter during the day