I remember seeing the gates that you are referring to. I'm guessing it is pretty effective at keeping oversize machines off the trailYes, they are pretty strict on the 50" rule. Most of the trails designated as 50" have an iron gate at the trail head that is just 50" wide. I have heard of a few people who were stopped and measured. If it's 51 you could get fined. I have a Polaris RZR Trail which is right at 50 and is legal. There are plenty of roads and trails in 45 that don't have this restriction though.