![]() * Orange, blue, green, white, yellow, purple light anywhere on the car so long as the SOURCE of light isn’t visible from the rear and providing the lights do not dazzle people The above only covers direct emissions of light (not shadows / reflections from the road), so what does this mean you can get away with? * The only lights visible from the rear of the car must be red, orange or white work/reverse/license plate lights * Orange lights can be used wherever you like * Red lights may only be visible from the rear of the car * The only flashing lights permitted on a car are turn signals (or as we brits call them, indicators) and a green flashing light indicating ABS in use Here in the UK the law isn’t clear until you look into it with a magnifying glass, I got bored one day and did so and this is how I’ve come to interpret the law, these apply to a civilian vehicle that is in motion on a public highway, the below covers light emitted from a bulb, LED and/or “retro reflective sticker” (the stickers you see on police car body panels), all lights are static unless stated ![]() I’d love something like this on my car, only yesterday I was trying to tell a Ford Focus driver that both her brake lights were out (I only knew she was braking from the few remaining LED lights in the strip above the rear windshield), I had to wait for 3 miles for her to pull up at the lights to let her know. Some states don’t allow it, I happen to know that Vermont does not allow amber flashing lights except for turn signals. Most tow trucks and other companies that aren’t emergency services use flashing amber lights. That’s why my LED message sign is an amber-only sign. You can have it front and rear, flashing or not (sometimes called ‘intermittent’). Key point: Usually, amber (orange) is allowed in all configurations. Flashing white or red is not allowed, except for a rear flashing red turn signal. Usually blue and green are not legal for use at any time. Usually you are allowed up to four forward-facing white lights, and some rear-facing red lights. Generally, the road law defines the type, quantity, and color of light that you are allowed to use. I can answer the question of legality, at least as far as Ontario is concerned. ![]() This is really neat! I did something similar in my car PC project: Posted in LED Hacks, Transportation Hacks Tagged 7400, atmega, car, display, led matrix Post navigation If you are looking for code or Eagle files, you can find those here. There are plenty of pictures of the grid in various stages of construction as well as videos of it in action in his Picasa album, so be sure to check them out. While we’re not well-versed on the legality of such a display, it looks great when animated. All of the ICs were deadbugged in place, helping achieve desire of keeping his view unobstructed. He used 74HC595 shift registers to manage the LEDs in groups of 5 columns, while an ATmega AT89C51 was tasked with generating the text and images to be displayed. Using a wooden template to get the spacing and positioning just right, he spent several days soldering the 600+ LEDs to one another. He decided that an LED matrix would be the best way for displaying images and text while on the go, so he got busy constructing a 40×16 mesh grid for his rear window. He planned on putting the display up in the rear window of his car, so he had to ensure that it did not obstruct his view while driving. Was sick and tired of discourteous drivers on the highway, so he decided that he would put together a display to let them know what he thought of their poor driving skills.
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