@CanadianMohawk is correct, I personally spoke with the OPP unit that patrols on ATVs in Limerick, Calabogie, Marlborough and other trails. The constable said that Marlborough is not and allowed riding area and there is a recent patrolling blitz in there. The signs have been updated, they have added and re-adjusted large rocks next to the closed gates and will be installing additional fencing/blockades at some key entrances that are frequently used by motorized vehicles.
I have also spoken, and encourage you to do so also (respectfully), to the Ward 21 councilor's office, Scott Moffatt 613-580-2491 or write to him
Scott.Moffatt@Ottawa.ca. Wendy, the office admin was very nice to speak with and did follow-up to get additional info on Marlborough forest and got back to me. The short outcome, no motorized vehicles (other than wheelchairs) are permitted in the forest from March to September. License plate color is of no importance.
We will need to get a significant group aligned and organized to have a united front to stand any chance at getting things to change. Organizations' getting involved, like the BMA and other clubs is the most likely way to get the bylaw to be changed if at all possible.
Since the BMA is the members' organization, we need to voice it to the executives that it is important to us, otherwise, no action will be taken. Similar for other clubs you may be a part of.
I hope this info is helpful and enough of you are as interested as me (and a few others) to put effort into pushing for change and gaining fair share of properties that our tax dollars pay for.
I've attached the VM from the counselor's office.