A lot of the MVUMs are not that great of a map. One would be hardpressed to look at one and then go find a trail or road. This makes for a nice excuse if caught. I recommend carrying the map with you and if caught pull it out and say "Gee I thought I was on this legal road". We ride a lot in the Santa Fe National Forest. There are no markings whatsoever on roads and trails saying that they are open or closed. You are supposed to have and understand the map. Theoretically the first year or two of the Travel Management process is supposed to be an Informational Period where LEOs are only supposed to warn you if you are on an illegal road.