IDIOMS

high road

(idiomatic) A course of action which is honorable, dignified, or respectable.

Example: 1883, Robert Louis Stevenson, The Black Arrow, ch. 6:
  There, a few yards before them, was the high road from Risingham to Shoreby, lying, at this point, between two even walls of forest.
1982 Nov. 22, Thomas Griffith, "A Tilt Called Cynicism," Time:
  The high road of public service and the low road of political advantage seem inextricably intertwined.