The utilities with active construction efforts are Southern Company, Scana Corp. and the Tennessee Valley Authority.

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Turkish construction firms are active all over Russia.

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The active section of the detector, under construction in Ash River, Minn.

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Others are active in hotel, road and other big construction, notably in Botswana and South Africa.

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Construction in that area has reduced the number of active train tracks from four to two over a seven-mile stretch there since March 2012.

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Construction is projected to take five years, including three years of active work on the roadway, and be completed in 2017, said Joe Keane, the bridge division's chief engineer.

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