Historical clue formulations

• Traffic marker — 2026-07-29
• Orange cone, say — 2026-04-05
• Bridge support — 2025-06-01
• Traffic marker — 2025-04-06
• Traffic cone — 2025-03-12
• Traffic director — 2023-07-21
• Traffic marker — 2022-03-26
• Air race marker — 2019-01-30
• Tall supporting tower — 2017-09-26
• Traffic cone — 2017-07-06
• Traffic cone — 2017-02-12
• Traffic cone — 2013-09-24
• Aviator's guide — 2012-09-09
• Traffic cone — 2012-05-11
• Traffic guide — 2010-06-19
• Race marker — 2004-01-06
• Aircraft course marker — 2003-12-01
• Pilot's guidepost — 2001-12-29
• Bridge tower — 1997-06-28
• Traffic cone — 1997-01-23
• Airfield tower — 1995-06-27
• Bridge marker — 1994-07-14