Do you still hear the sound of gears grinding on the jobsite? It soon may be a thing of the past. A trucker’s old friends—the shifter and clutch pedal—are headed toward extinction as drivers discover the benefits of automatic transmissions. Photo: Tudor Van Hampton for ENR Mack sales department expected to sell 50 automatic transmissions this year but sold 500. Related Links: Shifting Gears: Heavy Truckers Say Goodbye to the Stick Although more than 80% of domestic heavy-duty trucks are still sold with a manual transmission, experts like David Stahl, sales manager for Pittsburgh-based dealer TransEdge Truck Centers, think it
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.