From Longman Dictionary of Contemporary Englishhigh roadˈhigh road noun [countable] 1 old-fashionedTTR a main road2 → take the (moral) high road
Examples from the Corpus
high road• A paved high road forded the stream.• He screamed as loudly as his horse that was now blocking the high road with its failing death throes.• We seemed to drift into tranquility once we reached the long plateau stretch on the high road to Taos.• She was at least making the attempt to take the high road, only to run into a dead end.• Instead, I decided to take the high road.• A horse whinnied and reared; the troop trotted quickly out of the inn yard towards the high road. 