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Even the Tesla Cybertruck's Brake Lights Don't Make Sense
(www.thedrive.com)
This is a most excellent place for technology news and articles.
Mixed brake and turn signals are not legal in several EU countries.
It's been an issue with imported Jeep Wrangler US models, which run afoul not only of not having separate brake and turn lights but also not meeting spec about minimum surface of brake lights.
Some people were skirting around the regulations by registering them as off-road vehicles but those have to meet specific criteria (such as not being used primarily as a cool ride in the middle of an urban area...)