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Mmh, considering automatic cars are more likely to carry a dashcam, I'm not sure anyone would want to do something illegal in front of them.

Right, because the thought of someone having a dashcam has definitely prevented people from merging into a tight space.

As soon as dashcams are required by law and valid as evidence, it will make people wary.

This might not help. But automatic uploading to a public shaming site and/or to an automated police analytics engine should be enough.