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Here's a link to back-up the assertion:

http://indy500.tjs-labs.com/list-qual-streak.php?streak=5&sort=A&minyear=1950&maxyear=1964

I consider the Roadster Era to span from 1950 to 1964

-- Mycroft.Holmes 21:27, 2 November 2006 (UTC) reply

Here's a link to back-up the assertion:

http://tjs-labs.com/indy500/fast-qual-career.php?minquals=5&sort=F&minyear=1950&maxyear=1964

I consider the Roadster Era to span from 1950 to 1964.

A qualifier's normalized speed is considered to be his qualifying speed divided by the field average for that year.

-- Mycroft.Holmes 22:00, 2 November 2006 (UTC) reply