There are many problems with the bridge, and the piers are prone to displacement. Although the LR1600 can be successfully lifted, how can I avoid
Viewing post in FS22 Buildable Concrete Box Girder Bridge v1.0.0.1 comments
you have to use this mod like you are actually building a bridge. Where the piers go you have to level, then when they are in the correct place, you need to make them concrete by using the IC node. If you want to actually drive on it, you need to use the single span between the piers, as Farm Sim does not do a good job with keeping things rigid when a heavy object goes onto a lighter object.