Related Clues:

• Signpost distance
• King's "The Green ___"
• Unit of distance
• Track event not in the Olympics
• Kind of marker
• Distance not run in the Olympics
• Denver elevation
• 5,280 feet
• Pedometer unit
• Horse-race distance
• Eight furlongs
• 1/500 of the Indianapolis 500
• Odometer unit
• Marathon fraction
• Race length, perhaps