I do not know how it is coded but there needs to be some delay before the animation cuts in, or even an 'if on RoadwayLOD check'. I have a very long 'test' bridge made up of multiple 40m long platforms at absolute height of 700m; it spans a 2.5km canyon/gorge. I can walk my character (and drive vehicles) the full length without any issue and I can base jump off of it too. The issue arises for me when I attempt to disembark from whatever vehicle I am in. I have tried all vanilla vehicles and I always end up stuck in the Halo animation.