Before revision: Therefore a red light is used on the (left (port)) side to indicate "you must give way"; and a green light on the right (starboard ) side indicates "I will give way; you must stand on".
After revision: ()Therefore a red light is used on the (left (port)) side to indicate "you must give way"; and a green light on the right (starboard ) side indicates "I will give way; you must stand on".