Most new cars in China with self-driving tech include these turquoise lights. As it turns out, these lights don’t comply with passenger vehicle regulations. The only permitted exterior light colors are white, yellow, amber, and red. Just as turquoise exterior lights looked set to become the standard for cars running in autonomous driving modes , Chinese regulators have moved to ban them. As it turns out, the lights have been breaking local law since the moment they first appeared, so this is less a crackdown than enforcement that took years to arrive. Li Auto is widely credited with being the first automaker to use turquoise lights to signal when its cars were driving themselves, starting in 2022, with Mercedes picking up the idea a year later . From there the trend spread across most of China’s brands and then jumped to a few Western names, including Cadillac. What started off as a trend in China seemed as though it would inevitably spread...