Following the eighth traffic death linked to tunnel railings in Boston, the Massachusetts Dept. of Transportation released a report in April recommending that some of the Sumner Tunnel's 58,000 railings be removed or covered. According to state police, a truck driver from Salem, Mass., died on March 27, when he was thrown from his vehicle into handrails after hitting a Jersey barrier while exiting the tunnel at high speed without a seat belt. Recommendations include removing 14% or roughly 8,000 linear ft of maintenance walkway railing not needed for emergency egress, covering some railing in curved areas with chain link
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.