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312国道沪宁段于1991年建成,路面宽度为9米～12米。本次按一级公路高标准扩建,扩建后路面宽度为25.5米～43.5米,全长282公里(其中新改线100公里),主要工程量为:拆迁房屋116万平方米、路基土石方2053万立方米、软基处理280万延米、桥梁175座、互通和分离式立交19座,以及相应的安全服务设施等。项目总概算73.4亿。
312 National Road Shanghai-Nanjing section was completed in 1991, the road width of 9 meters to 12 meters. This time according to a high level of highway expansion, the expansion of the road surface width of 25.5 m ~ 43.5 m, a total length of 282 km (including the new line of 100 km), the main project volume is: 1.16 million square meters demolition of houses, 20.53 million cubic meters of roadbed earthwork 2.8 million meters of soft base, 175 meters of bridges, 19 interchanging and separate interchanges, and corresponding safety service facilities. The total estimated project budget is 7.34 billion.