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The present study attempts to quantify the carbon emission of vehicles on the toll and urban roads in the road network in Makassar City, Indonesia. In further, the study focused on comparison of the carbon emission level of both road types in the city. Finally, the study assessed the toll road contribution on environmental impacts regarding the carbon emission level for some scenarios of traffic distribution on the road network in the city. Data collection involve travel time of vehicle on both road types using vehicle flat matching of vehicle on the toll road, as well ass, using floating car method on the urban roads. The quantification of the vehicle carbon emission have adopted International Vehicle Emission Model, IVEM. The study has assessed the carbon emission impact for three analysis scenarios, i.e., existing condition, there is route shifting vehicle from the urban roads to the toll road in the city, and there is development of the toll road. The study results showed that the carbon emission level on the toll road was lower than on the urban roads for the three analysis scenario. Briefly, the toll road contribution on environmental sustainability is significant to decrease the carbon emission of the mix traffic on the urban roads.