Topic：Traffic emissions, modeling and calibration
Time：5月18日16：00
Add：Jiuli campus 4407B
Reportor: Henk van zuylen
Introduction：
Traffic has an important role in the air quality. Measurement of air quality is becoming more common these days. Emissions of pollutants by cars are more difficult to measure directly. Simulations are used to evaluate traffic emissions. Basically this evaluation consists of two steps:
- Simulation of vehicle trajectories
- Estimation of emissions from the speed and acceleration profiles.
The simulation of trajectories is done by microscopic simulation programs like VISSIM, Paramics, Aimsun, Corsim, MITSIM etc. However, these programs are often calibrated to produce valid travel times and queues, the trajectories are often not sufficiently valid for the estimation of emissions.
The car following model in the micro simulation program is the core of the calculation of trajectories. Several kinds of car following models are used by the different simulation programs. In this lecture the calibration of the Wiedemann model (used in VISSIM) and the Stimulus Reaction model as used in MITSIM is presented.