An adverbial clause (advcl) modifies another element in the sentence as an adverbial, and may take a semantic role.

The subordinating clause "if you go" as an adverbial.

The relative clause "where you go" as an adverbial.

When an open clause is used as an adverbial, the subject of the open clause is represented by the secondary dependency.

The open clause "to see me" as an adverbial.