Just like when the speed limit or name differs between two segments we are trying to merge, merging segments by deleting a node should not be allowed if:

• the segment elevations are different
• the number of lanes is different
• segment alternate addresses are different (or one does not contain an alternate address and one does)

The goal is to prevent segment elevation or routing errors when cleaning up seemingly unnecessary junction nodes in an area.

I might be forgetting some cases, so please feel free to add any relevant ones in the comments!