Estimation of road freight transportation emissions in Turkey

Özen, Murat
To obtain a more sustainable transportation system, it is also important to decrease both fuel consumption and carbon emissions in road freight sector, as well. The first step towards this goal is to determine the current level of road freight demand and related emissions. This is rather challenging in Turkey, because disaggregate commodity flow data does not exist. However, annual roadside axle survey, performed by the Turkish General Directorate of Highways, is a valuable source of circulation information, which are used jointly with aggregate level national freight flow statistics to develop a hybrid model in this study. Using this model, annual road freight emissions for the period of 2000 to 2009 are calculated with COPERT 4 software. The results show that CO2 level remained almost constant during this period. Secondly, a decrease of 25% is observed in the share of rigid truck emissions, while emissions from articulated trucks are tripled. Sensitivity of the model to the available level of disaggregate data is tested via scenario analysis. Assuming 2009 emissions as the base case, emission reduction potentials are evaluated for three interventions: While emissions could be reduced up to 11% by penalizing empty movements just only in the long haul, another scenario focusing on elimination of only inefficiently loaded movements did not provide significant emission reduction capacity. A scenario of replacing Conventional trucks with Euro IV ones showed significant potential, especially for regulated emissions, and it may be the most promising option from application perspective.


Türkiye de Şehirlerarası Yük Trafiği CO2 Emisyonlarının Tahmini
Özen, Murat; Tüydeş Yaman, Hediye (Dergipark, 2013-01-01)
Recently, road freight transportation dominates the freight sector in many countries including Turkey, which is causing a growing concern about environmental and sustainability issues. To develop better policies, road freight emissions have to be determined. Such evaluations are very challenging in the absence of disaggregate commodity flow data, which is the case in Turkey. As a solution, to calculate truck freight transportation emissions a model that combines national level national freight transportatio...
Modeling of freight transportation on Turkish highways
Ünal, Leyla; Türel, Ali; Department of City and Regional Planning (2009)
Transportation planners are often faced with the problem of estimating passenger and freight flows between regions. In the literature there are many models for passenger flows. However, models about freight flows are more limited. Modeling freight flow is also more complex than modeling passenger flow and there are many agents related with freight flows. In addition, data availability is a critical factor. In this research, freight flows between provinces in Türkiye are forecasted by demand analysis. Transp...
Assessment of applicability of performance-based contracts in Turkey for road maintenance services
Ateş, Koray; Öztürk, Hande Işık; Department of Civil Engineering (2019)
In the last decades, many countries have been in search of new contracting types for the road maintenance sector to reduce the cost by increasing efficiency. Performance-based contracting (PBC) for road maintenance services, which is one of the most popular approaches that has been preferred by many countries all over the world, has been reviewed in detail in this study. Although many studies and cases present the affirmative results of PBC, changing the road maintenance system from the traditional contract...
Best Option for Reducing On-Campus Private Car-Based CO2 Emissions: Reducing VKT or Congestion?
Altıntaşı, Oruç; Tüydeş Yaman, Hediye (2016-01-01)
Reducing carbon emissions, especially that of private car use, is an inevitable goal of sustainable transportation policies. This study focuses on i) determination of the current level of CO2 emissions from private cars on the Middle East Technical University (METU) campus and ii) evaluation of the impact of different emission reduction scenarios. Such scenarios were based on hypothetical conditions that can either reduce Vehicle-km-travelled (VKT) or congestion on campus, which are defined as the two major...
Optimal Battery Sizing for Electric Vehicles Considering Battery Ageing
Gezer, Ali; Ünver, Baki Zafer; Bostancı, Emine (2022-01-01)
Due to environmental issues such as emission of carbon gases and depleting natural resources, Electric Vehicles (EVs) are attracting more attention. To make EVs viable and widespread, the batteries' high cost and performance degradation problems have to be overcome. The degradation of the battery both in terms of energy capacity and power capability is highly dependent on conditions of utilization. To understand the relationship between energy utilization and battery size, an electric vehicle model that is ...
Citation Formats
M. Özen, “Estimation of road freight transportation emissions in Turkey,” Ph.D. - Doctoral Program, Middle East Technical University, 2013.