The Federal Highway Administration again has denied Pennsylvania’s proposal to put tolls on the state’s 311-mile stretch of Interstate 80. Pennsylvania says the denial will cost it about $460 million a year in projected revenue for roads and transit. After FHWA’s April 6 ruling, Pennsylvania Gov. Edward Rendell (D) said he will call a special session of the Legislature to address how to deal with the loss of the hoped-for funds. U.S. Transportation Secretary Ray LaHood said FHWA’s decision was based “on what is allowable under federal law.” Under a federal pilot program, revenue from proposed new tolls on an
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.