Courtesy Joe Woolhead/Silverstein Properties New York City is moving to a national testing model for licensing crane operators. Related Links: In One Week, Crane Operators Receive A License to Learn Video: Learning to Fly Crane regulation in New York City has had its ups and downs, but the city hopes to make work safer by boosting the requirements of operators working there. One part of the city's controversial new licensing program, announced earlier this month, is outsourcing crane operator exams to the private sector. The move has attracted praise and criticism alike.By July 1, 2013, all crane operators working in
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.