I think direction specific trails are extremely important and much safer. The only time 2 way single track should exist is if it doesnt return you to a trail head, in which the trail should accommodate passsing zones, etc. I hate when i find a new trail system that has a maze of legs and intersections. Sure, you can "create" your own route, but that IMO should have been established when the trail was built in the first place. Ad-one legs to improve the system can be built if the old leg is either marked or shut down....... IMO. I'm also more a freerider though, so I always believe the correct trail direction is the one that starts at the highest elevation and ends at the lowest
