Considering that all trails are essentially "damage" to the environment what do they expect the impact will be from ebikes. What is typically ignore in all these studies is the impact or erosion after the vegetation is worn away on any trail / path. When I use to volunteer to do train maintenance it was always clear that significant rain falls had by far the biggest impact. If that is ignored then any study is intentionally biased because this impact is true regardless even if only hikers are allowed on the trail.BRAIN report the lawsuit against the National Park Service brought by the PEER group has ended with a judge ordering the Park Service to perform the environmental impact review required under NEPA while continuing to permit ebike's in National Parks