I don't know how it is being handled in other locations, but I met a couple at the Lumberville trailhead on the D&L trail in PA. yesterday. They had just crossed over the Delaware River from NJ on the Bulls Island foot bridge. They were from PA and were trying to ride the D&R Canal trail on the NJ side of the river. They didn't know about the new law and were confronted by a park ranger at Bulls Island. No summons was issued but they were asked to leave with just a warning.
I thought this new NJ law applied only to public roads. Apparently, it includes trails as well.
The law has a grace period... Enforcement starts Jan 1, 2027.
Having lived on this planet for a while now and with the DMV reputation being what it is... running there on day one is, well