I used to lead hikes etc. on weekends, and when I didn't do it other people did, and we needed a good location to meet, near the Xway, both for people arriving and when we were all leaving. We carpooled so 3 out of 4 cars would be left there all day.
There was a quite small shopping center which always had a couple hundred empty spaces. Most of the parking was near the street, but some on the other 3 sides and I'd guess it totalled 300 spots with no more than 50 used at a time on weekends. No more than 150 used at any time during the week.
Eventually I found out indirectly that the owner of the property didn't like us doing this, so I would try to get people to have lunch or dinner at a restaurant there. (Some weekend days he drove by to check the center or the lot but he never left a note on a car.)
But the strange thing was the signs, along the outside border of the lot. "Cars must be parked between the lines" is all it said. And there were typical parking lot lines, white lines of the usual width on a black or dark grey pavement, spaced as they usually are in parking lots. It was easy to park between the lines and everyone did. I think we would have even were there no signs.
Nothing about illegal parkers being towed away.
What could he have wanted when he wrote those signs?
Have you ever seen signs like that?