This was my first thought as well. Both sodium hydroxide and sodium bicarbonate seem like they could have a signficant environmental impact. We'd need some good studies on that before committing to this idea, I think.
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Colorblind person here. If we're talking about limited visibility differentiation of front and back, the color of light is way less noticeable than whether we're looking at headlights or not (based on intensity). There would be no issue telling whether we're looking at a front brake light or a back brake light so long as the front brake light has headlights around it.