European driving in California here, some guy passed us on the right side on route 50 between Sacramento and Lake Tahoe (two lanes each way) and was very intently showing us this sign. What does it mean? What could we have done wrong?
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I don’t think it is a standard sign, but I would understand it as a reminder that there are two lanes - did you swerve over the divider, making it ‘one lane’ (and annoying him)?