When creating networks of lifts/runs, any lift that goes up to a lift hub is unable to run due to no downwards run.
See example below - I have lifts running from:
A > C
B > C
B > D
D > C
I want to offer a lift from A > B between to hubs of lifts, but because B has no downwards trails, the lift is disabled.
If there is a hub that has an onward lift, the restriction on downwards lifts should be remove, and the guest treat the first lift at the same difficulty/routing as the second lift(s).
