Because high-occupancy vehicle (HOV) facilities have become an integral part of the
freeway systems in many parts of the United States, transportation practitioners must
estimate emissions from these facilities accurately. This study examined the differences
between HOV and mixed-flow (MF) lanes relative to their traffic dynamics as described by
speed and acceleration profiles of the collected driving trajectory data, as well as to their
vehicle fleet composition. It was found that the model year distributions of vehicles in the two …