Counterpoint: when you're sharing a public road, the license of your car to share that road isn't private information.
... But I echo the concern with how the collection and aggregation of the data can be abused. I just don't have a great solution. "Don't use shared public resources to do secret things; they're incompatible with privacy" might be the rubric here.
As much hate as it gets, the GDPR has pretty clear guidelines for situations like these. Essentially, the purpose of the data collection matters. Your license plates may be public information as in they are visible in the public, but that doesn’t mean collecting the information is, or providing others access to it - without your consent.
... But I echo the concern with how the collection and aggregation of the data can be abused. I just don't have a great solution. "Don't use shared public resources to do secret things; they're incompatible with privacy" might be the rubric here.