  In this paper we propose a multiscale traffic model, based on the family of
Generic Second Order Models, which integrates multiple trajectory data into the
velocity function. This combination of a second order macroscopic model with
microscopic information allows us to reproduce significant variations in speed
and acceleration that strongly influence traffic emissions. We obtain accurate
approximations even with a few trajectory data. The proposed approach is
therefore a computationally efficient and highly accurate tool for calculating
macroscopic traffic quantities and estimating emissions.
