Motorway Traffic Emissions Estimation through Stochastic Fundamental Diagram

Travel time, or, more generally, level of service, has always been considered the main parameter with which to design roads, particularly in extra-urban areas where geometries and policies, such as speed limits, play a key role performance achieved. Unfortunately, this type approach does not consider impact on emissions that is obtained when only performance-based goals are pursued. The paper deals analysis fuel consumption under different traffic conditions, we present new methodology for emission estimation based stochastic formulation fundamental diagram highway environment. proposed estimates using adaptation CORINAIR COPERT software both specific vehicle types average Italian fleet. As expected, due convexity function, accounting dispersion leads an increase energy emissions. Tests show component can lead up 5.5% and, therefore, it should be considered. applied by means real trajectories, results application optimization strategies contrast sustainability reduction policies. Results some vehicular classes, or highly dependent speed, proportionalities. In all cases, minimum at speeds ranging from 70 90 km/h. curves shows speeds, even reach low generally per kilometer traveled independent decrease travel time.