IPA: //ˈhaɪˌroʊd//
KK: /haɪˌroʊd/
A route or path that is elevated or higher than the surrounding area, often used in a figurative sense to refer to a morally superior choice or action.
He chose to take the highroad in the argument, refusing to stoop to insults.
Highroad is formed from "high" (from Old English "hēah", meaning elevated or tall) and "road" (from Old English "rād", meaning a way or path). The term "highroad" refers to a main or elevated route, often used in contrast to a low or minor path.
Think of a 'tall' ('high') path ('road') — that's why a highroad is a main or elevated route.
No commonly confused words.