Where did the incident(s) occur? There are a few blind corners on the downhills we are working on placing warning signs. The trails are probably not going to be directional unless user conflicts become a big problem, which they don't seem to be at this point. Remember, if a rider is descending, it is their responsibility to yield to those climbing and at all times to ride within the limits of control in case they need to stop suddenly. When approaching a blind corner (from either direction), I have found it helpful to give verbal warning before going around and be prepared for someone to be on the other side.