Public humiliation has long been a part of judicial punishment. Specifically note the “walk of shame” from the police car up the courthouse steps. Given that most criminal behavior is recognized even by the criminal as being wrong and so they act out of sight of other people, opening their actions to society could be seen as an effective way of prompting reform.
Or not. I know that in a work environment, public humiliation for wrongdoing is counter productive and foments resentment. That’s a different situation, though, and may not parallel behavior in a more public setting.
I’ll be honest in saying I don’t know the studies either way. I will say that I think a 30 day suspension is too lenient and have my doubts as to whether the public humiliation will be enough to change behavior. She will certainly not be driving on the sidewalk to go around busses because she will know there’s a good chance of her being caught on fiolm again but people like that oftentimes don’t just commit one specific crime. I would bet she does a lot of other stupid and illegal things behind the wheel of her car and 30 days and an “I’m stupid” sign is unlikely to change that.