otherwise your trails are too small AND VERY dangerous, which i highly doubt is true....LOL
I have been on trails that, at least in segments, are barely wide enough for two sleds to pass without one pulling off part way. Don't know what the exact width is, but it's narrow. Not the entire length of the trail, to be sure.
Also....even if a trail is plenty wide, when you take into consideration a blown out curve where it is banked so high it's difficult at best to keep a sled on the right because gravity pulls it toward the center.....it now becomes pretty narrow. Again, it's not necessarily the norm but it does happen.
Nonetheless, I agree wholeheartedly with what Grub says. And I also agree with slotour, but unfortunately, you can't legislate or teach common sense. You can teach respect, and hope that the learner grasps it, but if the teacher doesn't have it, well.....so much for that.