Rpg Maker Developers Group

So im trying to make it to where the player can walk under some bridges that go from cliff to cliff but im having trouble making it look right and was wondering if someone could help me figure out how to make it look smoother. Here is what I currently have.



Now when walking north when the player touches the event it looks like the player is walking under the bridge.. BUT.. the player can now move on the bridge to the left and right  and can access the Cliffs this is a problem.. also if the player happens to stop on the bridge and turn around and go the other way the "When facing down" part of the south event dosent work same with the north event "when facing up" if the player is comming down and stops on the bridge and turns around the "when facing up" part of the event dosent work. I have tried placing the 2nd part of each event in the "Else" part of the events and it dosent work either.

So can someone help me figure out how to stop the character from being able to walk on the bridge and fix the turning around problems? Or is there a better, easier way to do this?