The large-scale transportation infrastructure construction in developing countries suchas China requires the empirical emission estimation to better schedule the constructprocess. This study estimated the Carbon Dioxide (CO2) emissions of four realhighway construction projects in Southwest China. The emissions were estimated inthree categories (raw materials production, materials transportation and onsiteconstruction) by using empirical equations with data from project budget sheets. Inparticular, the emissions from bridge and tunnel constructions were also estimated andcompared with roadway construction. The results show that over 80 percent of theemissions of four selected projects were generated from raw material production. Theonsite construction and raw materials transportation were 10 and 3 percent,respectively. In addition, the constructions of bridges and tunnels generated moreemissions than roadways. The emissions of different types of constructions: road is5,229 kg/m, bridge is 35,547 kg/m, and tunnel is 42,302 kg/m. The empirical emissionestimations may benefit for highway design and planning to reduce the totalemissions.
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