It would be proven in court the same way as if you got a ticket for loitering or vagrancy or creating a hazardous condition. These matters are left to the discretion of the cops. If the cops say that your conduct was disturbing or otherwise amounted to violation of those laws, the judge doesn't second-guess them. The judge is not in charge of the details of how the cops do things like manage traffic or enforce public safety and won't get involved when there's no constitutional right at stake.
OK let me see if I can explain this better: Imagine if the cops decide that a certain lane on a highway is "dangerous" and, and since they are charged with administering public safety, they go ahead and close that highway lane, thus effectively preventing you from driving on that lane. You decide to go ahead and drive there. The cops issue you a citation and you go to court. The cops don't have to explain to the judge WHY they though the lane was dangerous and WHY they closed it. The only "proof" they need to show is that you were driving on a closed lane. In your defense you can't argue, "but your Honor, it really wasn't dangerous and so should not have been closed." You don't get to demand that the cops explain WHY they thought the lane should be closed. You never had a "right" to drive your car in the first place, and certainly not on that lane. The decision to close that lane is up to the cops not up to you or the judge. It is THEIR job to decide what is and what is not "safe" or "disturbing" The decision is left in the discretion of the cops. Unless there's a constitutional right at stake the judge doesn't second-guess the cops.
Clear?
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