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Initially, the star was illuminated in all-white.
Later, the star's color would change from white to red to indicate a traffic fatality on that day.
As part of the bicentennial celebration in 1976, the design was changed to an outer single star of red encompassing inner double-stars of white and blue.
Generally all the colors have been lit at once, but occasionally the colors have been lit in a repeating sequence: each color shows exclusively for a second or two, or in succession.
To commemorate a tragic event, the red outer star has been used alone, in a manner akin to a lowered flag.
Such commemorations have been made for national and local events.
After the September 11, 2001 attacks, the star was kept in a red, white, and blue configuration for nearly six years, until April 2007.

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