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  • Bridge Building

    ThamKC Getty Images/iStockphoto

    Bridge Building

    Construction of a mass transit train line in progress with heavy infrastructure. This photo shows the progress in joining the various blocks/modules of the line with heavy equipment.

  • Warning lights

    anna parciak Getty Images/iStockphoto

    Warning lights

    Warning lights can enhance safety but also pose risks, research finds. Photo by anna parciak/