The new hours weren’t supposed to affect the usage along the trail itself, but you’re correct that it has made it much more difficult to access the trail from the Adams Morgan area. At a recent meeting to discuss the rehabilitation of the trail and the bridge just south of the tunnel, there was mention of putting in a connecting trail from Harvard for when the gates are closed and a cross walk to the trail. however, they had no plans to make this a signaled crossing. It doesn’t sound like the zoo will be changing the access hours anytime soon.