INRIX Gridlock Index for May 2013 Shows U.S. Traffic Congestion Continues to Rise, Signaling Good News for the Economy, Wash., June 26, 2013 /PRNewswire/ -- Data from the most recent INRIX Gridlock Index (IGI) shows traffic congestion rose nationally more than nine percent in May, signaling the continued strengthening of the national economy as retail sales increased 0.6 percent...



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