Article review: “Genetics of traffic assignment models for strategic transport planning”

Article review: “Genetics of traffic assignment models for strategic transport planning”

Engineering, paper review
The article under review is about traffic assignment models which are used to forecast traffic flows and travel times for strategic (long-term) transport planning and project appraisal [1]. To review and classify traffic assignment models, the authors analogize them to genetics. The article says every traffic assignment model has the same DNA (theoretical framework) for strategic transport planning, but different genes (capability). There are three genes: spatial capability, temporal capability and behavioural capability, which are defined to describe models. Each capability contains three or four assumptions which the authors liken to nucleotides. In addition, each assumption has different features, and the authors use the first letter of each feature to code the feature [1]. For example, one assumption for spatial capability is shape of the fundamental diagram which could be linear,…
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Paper review: Impact of horizontal geometric design of two-lane rural roads on vehicle CO2 emissions

Engineering, Environment, paper review
The original paper link is here. In this paper, the authors evaluate the impact of horizontal highway geometric design features on CO2 emissions with VT-Micro, a microscopic emission estimation model. The authors believe that too little research thus far has focused on the effects of horizontal alignment on GHG emissions, compared with the number of studies that evaluate the influence of vertical alignment. The authors study a database of more than 16,000 veh-km collected in 2008 on 11 two-lane rural road sections which were divided into 29 homogeneous road segments according to their Curvature Change Rate (CCR). To estimate CO2 emissions, instantaneous speed and acceleration are used as input variables for the VT-micro model. The paper provides geometric analysis, operational analysis, and combined analysis. As for geometric analysis, the study…
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