Definition of distance post in English:

distance post

noun

North American
  • A post placed at a specified distance before the finishing post on a racecourse, which a horse must have passed when the winner finishes in order to qualify for a subsequent heat.

    • ‘Most races have distance posts along the route, so you'll know how you are progressing.’
    • ‘A horse that had not passed the distance post by the time the winner had got home was 'distanced' and eliminated from the next heat.’
    • ‘Blacklock had a three length lead at the distance post.’