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Obituary: L.A. Traffic Reporter Loyd C. Sigmon

All Things Considered remembers Loyd C. Sigmon, who in 1955 invented the "SigAlert" system of messages that warn Southern California motorists about freeway traffic jams. The alerts were meant to draw more listeners to the radio station where he worked. Sigmon died at age 95 on Wednesday.

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Morning EditionAll Things Considered