Turns out that my previous attempt at posting the following must have failed due to the length of time it took, must have been timed out. So this time I copied it and then pasted for instant results. Here it is:
Earlier this week, I was driving my car no more than a couple of kilometers from my home. It was late with few cars around. I did not commit a driving infraction, but was nonetheless pulled over. When the officer walked up to my window, I asked him "a right turn is allowed on a red there, is it not?", being puzzled as to why I had been pulled over. He said that it is allowed, but I "almost hit another car". This was total b/s, as there were no other cars around when I was making the turn.
He said nothing more about that and asked for my papers, which I showed the officer, and everything was in order. Then he started to complain about my historic vehicle plates, saying that they're to be used only for going to car shows, and since there are no car shows around at 1 am, I should not be driving the car. Speaking in quite a rude and angry manner, he said that he'll let me off this time, but threatened that if he sees me driving the car again, he'll not only give me a ticket for improper use of the plates, but confiscate them, and call my insurance company to tell them I'm using the vehicle improperly. He didn't care when I told him my other car was broken down, he just went on to repeat his threats again. I didn't argue with him, since I didn't want to further feed his likely steroid-induced anger, and just said "yes sir, I understand." After that he handed me my papers and told me to go. Interestingly, he didn't even bother to go back to his car to check my license for warrants, etc.
Now his threat about calling my insurance doesn't at all concern me, since I wasn't doing anything contrary to my policy requirements. What I would be concerned about, however, is if in fact he has the authority to confiscate my plates, even though they're up to date and registered to the vehicle. I looked up that, although historic plates are indeed to be used only for parades or shows organized by car clubs, other uses are also permitted, these being "for purposes of repair, testing, and demonstrations for sale". Now just about every trip in a car can be excused by one of the preceding reasons. I can say I'm going to get my tire fixed. Or get a paint job estimate. Or I just adjusted the timing so I'm testing if it runs better. Or my passanger is interested in buying the car.
In any case, I doubt that there is a single owner of a historic plated vehicle who has never used their vehicle for a purpose other than one stated as permitted in the HTA. I think that the intent here is, or at least certainly should be, that the vehicle isn't used as a primary use vehicle for commercial uses or even commuting to/from work, that there be another vehicle registered to the owner for such purposes. That certainly is the case with me, and I think its ridiculous that a cop would waste his time to harrass a motorist with historic plates just because he happens to be out for a cruise late at night.