Photo by Tudor Van Hampton for ENR GETTING IT DONE: Caterpillar still has some work to do on its first heavy-duty truck, but the CT660 is a solid start and a quick study on and off the road. Photo By Tudor Van Hampton for ENR The CT660 interior features a simple instrument layout and a quiet cab. Cat says it has muffled noise by 3 decibels, or about 50%, compared to other work trucks. var so = new FlashObject ("http://construction.pb.feedroom.com/pb-comp/construction/custom1/player.swf", "player", "299", "196", "8", "#FFFFFF"); so.addVariable ("SkinName", "custom1"); so.addVariable ("SiteID", "construction"); so.addVariable ("SiteName", "Construction Online"); so.addVariable ("ChannelID", 'ddbece80fa300acfee86311d89c2f6b86bdda260'); so.addVariable ("StoryID",
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.