MattFoley

Well, MUPs generally aren't covered under laws in the same ways roadways are, so it's not the "law" per se. However, the "rules" posted on the MUPs in this area--and I'd assume most other areas as well--explicitly say that slower "traffic" should keep to the right. The Washington and Old Dominion trail, for instance, states: "When on the trail, please travel in the right lane only, and pass on the left." The Mount Vernon Trail, which is administered by the US Park Service, lists under "trail rules and etiquette" to: "stay to the right". So IMHO, Ursa Minor was correct in the situation with the joggers...they should've been on the right side of the trail.