Evaluation of mobile source greenhouse gas emissions for assessment of traffic management strategies.
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2011-08-01
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Edition:Research report; Sept. 2009-Aug. 2011.
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Abstract:In recent years, there has been an increasing interest in investigating the air quality benefits of traffic
management strategies in light of challenges associated with the global warming and climate change.
However, there has been a lack of systematic effort to study the impact of a specific traffic management
strategy on mobile source Greenhouse Gas (GHG) emissions. This research is intended to evaluate
mobile source GHG emissions for traffic management strategies, in which a Portable Emission
Measurement System (PEMS) is used to collect the vehicle’s real-world emission and activity data, and
a Vehicle Specific Power (VSP) based modeling approach is used as the basis for emission estimation.
Three traffic management strategies are selected in this research, including High Occupancy Vehicle
(HOV) lane, traffic signal coordination plan, and Electronic Toll Collection (ETC). In the HOV lane
scenario, CO2 emission factors produced by the testing vehicle using HOV lane and the corresponding
mixed flow lane are compared. In the evaluation of traffic signal coordination, total CO2 emissions
produced under the existing coordinated signal timing and the emulated non-coordinated signal timing
along the same designed testing route are compared. In the study about ETC, total CO2 emissions
produced by the testing vehicle around an ETC station and a Manual Toll Collection (MTC) station
located on the same toll road segment are estimated and compared. The results demonstrated that HOV
lane, well-coordinated signal timing, and ETC are all effective measures to reduce mobile source GHG
emissions, although the level of effectiveness is shown to be different for different strategies.
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