Optimal Speed Model of Urban Underwater Tunnel Based on CO2 Emissions Factor

This study aims to reduce air pollution caused by vehicle emissions in confined spaces and realize low-carbon travel urban underwater tunnels. Based on the MEET (Methodologies for Estimating Air Pollutant Emissions from Transport) COPERT (Computer Programme Calculate Road models, combined with real test data, an tunnel speed–CO2 factor model was constructed. Results show that: Different working conditions have a great impact model; load slope factors expand actual CO2 factor, which is different situation. The negatively correlated speed, there are fewer variables model, so parameters more controllable line According gasoline consumption taking CO2, i > GC as judgment index, optimal limit speed of ramp calculated be 40 km/h, while main maintains existing state 60 km/h. simple easy operate, can applied estimate at tunnels other cities, providing basis traffic management effectively realizing travel.