My spin on an OG question to clarify a concept

[ParthJ26]

Dear Instructors,

Hi!

1. A Indo-Sino study, finding it to be both feasible and lucrative to open air traffic routes over the North Pole, which are currently used by only two or three planes a day.

The above set of words is a fragment. There is no verb. But that is not the concept I would like to build upon.

In my opinion, COMMA + WHICH is correctly placed here and refers back to "air traffic routes" AND NOT "the North Pole" because "the North Pole" is the object of preposition "over the North Pole" and therefore, is not the closest preceding main noun.

Please tell me whether I am right or wrong.

Thanks in advance.

Parth Jain

[Sage Pearce-Higgins]

That makes sense and I'd say that your use of the comma which modifier is correct here. However, remember that the ultimate test is whether the meaning of the sentence is clear.