create a corridor without a surface?

[Maverick91]

Can I create a corridor without an existing or a proposed ground surface? I'm beginning to experiment with corridor work. Most of our alignments are elevated bridge structures, only occasionally intersecting a ground surface. TIA.

[Jeff_M]

Yes. A surface is only required when you want to daylight to it. You DO need at least one of each of these: an alignment, profile, and assembly.