Below is a suggestion I made to the good people at Tesla. They requested I post it it to the teslamotorsclub forum because they're interested in seeing how much support there is from other people. Elon Musk has talked a lot about safety being a priority and I'm very glad about that. But why do the Roadster and the Model S both have red turn signals at the back instead of amber? The car already has two other sets of red lights at the back -- the red rear lights and the red brake lights. Having a third meaning for red lights at the back means that when another driver sees a red light at the back of your car, it takes their brain a split second to determine whether that's just a red rear light, or a red brake light, or a red signal that you're about to change lanes. The only visual difference between a driver tapping the brake pedal and a red turn signal is that with tapping the brake pedal both red brake lights blink together, whereas with a turn signal only one red light blinks, but discerning that difference is only possible if the other driver is able to see both the left and right light clusters at the same time. For example, a driver behind you one lane to the left in traffic may only be able to see the left cluster, not the right. When they see a red blink in the left light cluster does that mean you're slowing down, or that you're about to change lanes? The split second of extra time it takes them to realize it's a turn signal instead of a brake light could be, in some cases, the difference between an accident or not. NHTSA reports I found on the web seem to support this intuitive reasoning. As is often the case with such studies, the effects can be small, and the causality sometimes unclear, but even if some might claim that the results are inconclusive, it's hard to understand why Tesla would not err on the side of safety. Some quotes from "The Influence of Rear Turn Signal Characteristics (September 2008)": <http://www.nhtsa.gov/DOT/NHTSA/NRD/Multimedia/PDFs/Crash%20Avoidance/2008/811%20037.pdf> Some quotes from "Effectiveness of Amber Rear Turn Signals for Reducing Rear Impacts (April 2009)": <http://www-nrd.nhtsa.dot.gov/Pubs/811115.PDF> And some other interesting comments I found on the web: <http://en.wikipedia.org/wiki/Automotive_lighting#Turn_signal_colour> <http://mbz.org/articles/lighting/amber/> Given that for other markets Tesla has to produce the Model S with amber rear turn signals, why not sell it with the same amber rear turn signals in the US also?