Marcus Vinicius Oliveira Camara, Thayse Ferrari, Glaydston Mattos Ribeiro. 

Abstract: Monitoring highways and obtaining traffic data are relevant for planning and programming new investments. This data often comes from automatic counting stations or roadside traffic surveys that can also obtain socioeconomic and trip origin and destination information. This paper presents novel contributions to address the Bi-objective Support Unit Location Problem to Assist Roadside Traffic Survey with Multi-Stages (BSULP). The objective of this research is to propose an approach to optimize two conflicting objectives simultaneously: minimizing travel costs from support units to survey stations and minimizing the number of selected support units. To achieve this, we propose three modified versions of the NSGA-II algorithm, with tailored strategies for constraints handling of the BSULP. These strategies involve a significantly reduced structure for the chromosomes, and initial population, crossover and mutation algorithms that maintain the feasibility of the solutions. For a benchmark of instances, we implemented an exact -Constraint method, and the results were compared with different versions of modified NSGA-II using Hypervolume (HV) and Generational Distance (GD) metrics. The best results were obtained with the M3NSGA-II version, which on average represented more than 94% (HV) and less than 17% (runtime) of the exact method. In addition, it was possible to obtain solutions for large instances which was not possible with the exact method.

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Veronica,Ghisolfi, Lorant  Antal Tavasszy , Gonçalo Homem de Almeida Rodriguez Correia , Gisele de Lorena Diniz Chaves , Glaydston Mattos Ribeiro. Transportation Research Part D.

Abstract: Freight transport decarbonization is challenging due to the slow implementation of policies to meet climate goals. This paper analyzes the dynamics of the implementation of freight decarbonization measures. A System Dynamics model was developed and applied to the Brazilian freight system to simulate the use of more sustainable modes and means of transport, including electrification, increased use of biofuels, acceleration of fleet renewal, and modal shift. Significant emission reductions are found in the scenarios combining a shift to alternative modes and a rapid phase-out of diesel vehicles. Even so, the Brazilian freight sector’s emission budgets towards limiting global warming to 1.5 ◦C and 2 ◦C will be depleted during the current and next decade, respectively. An absolute reduction of carbon emissions before 2050 seems unlikely. Besides confirming the need to study the dynamics of the freight system, the findings corroborate the urgency for stronger actions on freight decarbonization.

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