Historical clue formulations

• Important route — 2026-03-26
• Cardiac conduit — 2024-04-14
• It comes from the heart — 2024-03-04
• Throughway, e.g. — 2020-11-15
• Major highway — 2017-10-02
• Vein's counterpart — 2013-04-22
• One may service an organ — 2012-12-14
• I-5 through Los Angeles, e.g. — 2011-07-24
• Main line — 2011-05-31
• Boulevard, e.g. — 2009-11-08
• Vein's counterpart — 2009-04-27
• Boulevard, e.g. — 2009-03-01
• Angiogram sight — 2008-09-25
• Red line? — 2007-08-24
• Throughway — 2005-02-25
• Main line — 2003-09-06
• Traffic site — 2000-09-28
• Angioplasty target — 2000-09-19
• 25-Down, e.g. — 2000-01-24
• Main conduit — 1998-09-06
• Main road — 1996-08-21
• Thoroughfare — 1995-10-12
• Thoroughfare — 1995-05-18
• Boulevard — 1994-01-05