CAPTCHAs don’t prove you’re human – they prove you’re American (2017)
Anyone with a half functioning brain can figure out which ones are the taxis. Taxis are not yellow in my country and I would have no issue picking those out. They have the very distinctive sign on the roof that no normal car has.<p>Not even OP was confused by this, they are just complaining on the behalf of some theoretical person who might get confused.