Learn Farsi: پلی دیگر در این بزرگراه ساخته خواهد شد. - Another bridge will be built on this highway.

It combines the past participle of the main verb (sâkhte, from sâkhtan, to build) with the future tense of the auxiliary verb shodan (to become). Here, khâhad shod means it will become, so the whole phrase literally means it will become built.

Why is another bridge translated as poli digar instead of digar pol?

To say another of something in Farsi, you typically attach the indefinite suffix -i to the noun and follow it with the word digar (other). So pol (bridge) becomes poli, followed by digar.

The word for highway, bozorg-râh, looks like a combination of two basic words. Is that right?

Yes! It is a straightforward compound word made of bozorg (big) and râh (way or road). This is the standard Farsi term for a highway or expressway.

Why does the sentence use dar (in) for the highway instead of a word for on like ru-ye?

While English says a bridge is built on a highway, Farsi generally treats streets, roads, and highways as locations or systems you are in. Using ru-ye (on top of) would sound overly literal, as if the bridge is simply resting flat on top of the asphalt surface.