So this is kind of along the same line. I was riding along the rail trail yesterday near Caledon and the rail trail was also closed and under construction (looked pretty safe to me) so I rode until I saw a skid steerer and then did a hike a bike. At this point, I think the worker was more confused ("who does that?!") at me being in this forest with a bike over my back than worrying about the closed path sign.
Saw the construction guy again today. He asked for your number ;-)
My gut tells me that we have zero common interests!
Oh, so I shouldn't have given it to him!? :-)