What is it about?
Signal control strategy has a huge effect not only on intersection operations but also on traffic emissions. Using the second-by-second data of vehicular velocity and acceleration, the mathematical expressions are presented to calibrate the emission factors during green/red on the basis of vehicle specific power (VSP). Given some necessary constraints, a single-objective optimization model and a bi-objective optimization model are formulated with the concern of traffic emissions. Considering three levels of traffic demands and two methods of signal timing, the numerical examples are carried out by utilizing the VISSIM and MATLAB software packages.
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Why is it important?
Based on vehicle specific power (VSP), the emission factors during green and red are defined and calibrated using the second-by-second data of velocity and acceleration. Two optimization models are formulated to minimize traffic emissions at isolated intersections.
Perspectives
The findings indicate that the emission factors during green are explicitly greater than those during red and they are all stable for each pollutant and for each lane group; a scientific signal control system can simultaneously reduce vehicle delay and traffic emissions for isolated intersections.
Ronghan Yao
Dalian University of Technology
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This page is a summary of: Emission factor calibration and signal timing optimisation for isolated intersections, IET Intelligent Transport Systems, March 2018, the Institution of Engineering and Technology (the IET),
DOI: 10.1049/iet-its.2016.0332.
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