Development of a corrected average speed model for calculating carbon dioxide emissions per link unit on urban roads

•Average speed model is underestimated CO2 emissions at traffic congestion.•We developed a more realistic and improved model for calculating CO2 emissions.•The subject was to develop a corrected average speed model.•Proposed corrected emission model should be used for a traffic speed below 20km/h. T...

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Bibliographic Details
Published in:Transportation research. Part D, Transport and environment Transport and environment, 2015-01, Vol.34, p.245-254
Main Authors: Ryu, Byoung Yong, Jung, Hee Jin, Bae, Sang Hoon
Format: Article
Language:English
Subjects:
Accuracy
Average emission model
Carbon dioxide
Emission analysis
Instantaneous emission model
Links
Mathematical models
Roads
Traffic engineering
Traffic flow
Urban traffic
Vehicles
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Summary:•Average speed model is underestimated CO2 emissions at traffic congestion.•We developed a more realistic and improved model for calculating CO2 emissions.•The subject was to develop a corrected average speed model.•Proposed corrected emission model should be used for a traffic speed below 20km/h. The purpose of our study is to develop a “corrected average emission model,” i.e., an improved average speed model that accurately calculates CO2 emissions on the road. When emissions from the central roads of a city are calculated, the existing average speed model only reflects the driving behavior of a vehicle that accelerates and decelerates due to signals and traffic. Therefore, we verified the accuracy of the average speed model, analyzed the causes of errors based on the instantaneous model utilizing second-by-second data from driving in a city center, and then developed a corrected model that can improve the accuracy. We collected GPS data from probe vehicles, and calculated and analyzed the average emissions and instantaneous emissions per link unit. Our results showed that the average speed model underestimated CO2 emissions with an increase in acceleration and idle time for a speed range of 20km/h and below, which is the speed range for traffic congestion. Based on these results, we analyzed the relationship between average emissions and instantaneous emissions according to the average speed per link unit, and we developed a model that performed better with an improved accuracy of calculated CO2 emissions for 20km/h and below.
ISSN:1361-9209
1879-2340
DOI:10.1016/j.trd.2014.10.012