Sproul State Forest, PA: Should the Bloody Skillet ATV trails (and other DCNR operated designated ATV trail systems) be set to foot/bicycle/horse: no?
The ATV Riding page mentions "It is important to practice common courtesies when riding your ATV on a trail: ... Yield the right of way to bikes, horses, and hikers"
https://www.dcnr.pa.gov/Recreation/WhatToDo/ATVRiding/pages/default.aspx
The DCNR ATV policy does not mention anything for/against other users on ATV trail systems: https://elibrary.dcnr.pa.gov/GetDocument?docId=3454622&DocName=DCNR%20Final%20ATV%20Trail%20Policy%20-%20November%202020.pdf
Michaux mentions "Motorcycles and trailbikes are not permitted on all-terrain vehicle trails." but no mentions of hikers/horses, and it is unclear whether "trailbikes" are motorized off-road vehicles or human powered pedal bicycles (which would lead to bicycle: no). On other DCNR maps, non-motorized pedal bikes are referred to as "mountain biking" or "bike" in the map legend.
I asked a state park ranger about this and the ranger was not sure.