Biennial Report of the State Highway Commission of North Carolina . State Highway Commission 53 Due to the increase in motor vehicles traffic and the policy of huildingpermanent structures on the State system of highways, it was decided toincrease the width of roadway on drainage structures from eighteen feetto twenty feet and design these structures for two fifteen-ton trucks passingon the structure. This necessitated revising our standard drawings both forsubstructure and superstructure. These standards are now practically com-pleted and are in use. Upon investigation it was found that by ha
Biennial Report of the State Highway Commission of North Carolina . State Highway Commission 53 Due to the increase in motor vehicles traffic and the policy of huildingpermanent structures on the State system of highways, it was decided toincrease the width of roadway on drainage structures from eighteen feetto twenty feet and design these structures for two fifteen-ton trucks passingon the structure. This necessitated revising our standard drawings both forsubstructure and superstructure. These standards are now practically com-pleted and are in use. Upon investigation it was found that by having these standards litho-graphed, the cost of both preparing plans and blue-printing could bereduced. At the present time the majority of these standards have beenlithographed and the rest are practically ready for use. Cuts showing the typical design of the various structures now in use areshown elsewhere in this report. Drafting Room During the period covered by this report plans have been prepared andcontracts let for the following structures:Reinforced Conc
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