I had an idea while waiting for the bus this morning. I’d noticed that more and more tail lights on vehicles are composed of individual LEDs (Light Emitting Diodes). It would certainly possible for the LED controller to turn each one on and off in a pattern. The delay between each LED would have to be small, so the effect wouldn’t be too distracting. I think a fast spiral would be simple and a cool effect. There might very well be laws regarding light response times, frequency of pulse, period of pulse and so on, but it shouldn’t be hard to work within those constraints.
Anyone interested in getting into the after-market tail lights, feel free to take this idea and run with it. I’d rather see something like this out there than sit on it and wait for nothing to happen.