Cira Pitombo

Cira Pitombo
University of São Paulo | USP · Departamento de Engenharia de Transportes (STT) (São Carlos)

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82
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433
Citations
Citations since 2017
55 Research Items
392 Citations
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2017201820192020202120222023020406080
2017201820192020202120222023020406080

Publications

Publications (82)
Article
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The main aims of this article are: (1) to evaluate the quality of cycling infrastructures in the city of João Pessoa (PB) using the Analytic Hierarchy Process (AHP) and (2) to extend the proposed assessment (using quality indicators) to the entire cycling network of the municipality applying geostatistical spatial interpolators. Therefore, a two-st...
Conference Paper
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Os impactos do crescimento do teletrabalho decorrente da pandemia da COVID-19 sobre a mobilidade urbana têm sido foco de intenso debate no meio científico. Para compreender melhor esse fenômeno, a presente pesquisa propôs a realização de um levantamento com empregados e empregadores de diversas partes do Brasil, analisando suas relações com atribut...
Conference Paper
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A pandemia de COVID-19 causou importantes e repentinas mudanças ao redor do mundo. No âmbito educacional, o ensino presencial tradicional foi substituído, onde foi possível, pelo ensino remoto emergencial. Além da imprevisibilidade e da falta de recursos envolvendo essa transição, problemas como a falta de engajamento dos alunos surgem como consequ...
Article
Full-text available
A pandemia de COVID-19 causou importantes e repentinas mudanças ao redor do mundo. No âmbito educacional, o ensino presencial tradicional foi substituído e deu lugar ao ensino remoto emergencial. Além da imprevisibilidade e da falta de recursos envolvendo essa transição, problemas como a falta de engajamento dos alunos surgem como consequências ine...
Article
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The COVID-19 pandemic has brought about considerable changes to human mobility. Although circulation restrictions are being lifted worldwide following the mitigation of the crisis, the understanding of its long-term effects is still limited. This paper addresses the situation of business meeting trips made by public officials in Brazil by gauging t...
Chapter
This chapter provides an overview of important mobility changes in Brazil due to COVID-19. This developing country with continental dimensions has substantial internal disparities in economic and social conditions. Remote work and education, for example, have not always been an option because of unequal Internet access conditions. Air transport has...
Article
Full-text available
Boarding and alighting modeling at the bus stop level is an important tool for operational planning of public transport systems, in addition to contributing to transit-oriented development. The interest variables, in this case, present two particularities that strongly influence the performance of proposed estimates: they demonstrate spatial depend...
Article
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Discrete choice models have been used over the years in disaggregated approaches to forecast destination choices. However, there are important constraints in some of these models that pose obstacles to using them, such as the Independence of Irrelevant Alternatives (IIA) property in the Multinomial Logit model, the need to assume specific structure...
Article
This article presents an analysis of the competitiveness of Brazilian container port terminals and discusses the implications for the sustainable development of this sector in Brazil in the context of container ship size maximization. A cluster analysis was developed. Thirteen criteria were selected in the analysis taking into consideration both th...
Article
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This article was motivated by the urban mobility changes observed at the onset of the COVID-19 pandemic in Brazil. We aim to analyze travel behavior before and during the COVID-19 pandemic in Brazil considering two samples of revealed preference online data, independent samples tests, multinomial logit models (MNL), and mixed logit models (ML). The...
Article
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This research investigates the potential of inducing willingness to travel less by car with a Car-Free Day campaign and reveals under which circumstances it could be more effective. An online survey was conducted after the event, wherein questions about attitudes toward the campaign, participation and intention of traveling less by car, as well as...
Conference Paper
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This article aims to analyze travel behavior before and during the COVID-19 pandemic period in Brazil considering two samples of Revealed Preference online data and independent samples tests and Classification And Regression Tree algorithm. The results show that ridesourcing was used for work, studies and leisure purposes before the pandemic. Alrea...
Conference Paper
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Considering the issue of overlapping between lines and bus stop catchment areas, as well as the spatial dependence of public transport demand variables, has not been appropriately addressed in the scientific literature, the present study proposed the modeling of the number of Boardings per bus stop along two lines with overlapping sections. The eff...
Article
Most of the problems associated with discrete choices involve a small number of alternatives. In cases with many alternatives, however, in addition to the concerns regarding data collection, the calibration process may be a problem as it is usually computationally expensive. Moreover, the available tools may be restricted concerning a large number...
Article
This study aimed to design Stated Preference (SP) scenarios for evaluating ride-hailing implications on transit. Furthermore, it proposes to identify the main factors that influence ride-hailing in Brazil. Based on these factors, attributes can be chosen to formulate SP scenarios to evaluate the propensity of transit users to use these new services...
Article
Brazil and Portugal are historically related; however, they differ regarding at least economic development, infrastructure, and road safety. Identifying risk behaviors contributes to supporting actions focused on the human factor to mitigate crashes. In this study, as part of an electronic survey, we examined the risk behaviors that drivers from Br...
Article
Freight transportation in Brazil is characterized by the predominance of the road mode. This imbalance in the sector suggests the need to develop efficient strategies that can increase competitiveness of alternative modes . However, in Brazil, there are few studies investigating firms’ preferences concerning different attributes of travel modes. Th...
Article
Important correlations between the morphological characteristics of the urban network and travel behavior can be found in the literature of urban and transport planning. Considering the significant growth in the production of Volunteered Geographic Information, research opportunities in this area are promising. This paper evaluates the usefulness o...
Article
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The choice of port is one of the topics that most interest researchers. Port selection behaviour may vary depending on port user perspectives. Prior studies have attempted to determine user preferences for certain port choice factors, but there are only few studies in developing countries, such as Brazil, where there is a lack of studies on this to...
Article
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Travel demand models have been developed and refined over the years to consider a characteristic normally found in travel data: spatial autocorrelation. Another important feature of travel demand data is its multivariate nature. However, regarding the public transportation demand, there is a lack of multivariate spatial models that consider the sca...
Article
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The classical travel demand modelling overlooks an important factor normally found in the interest variables: spatial autocorrelation. Recent research recognises and includes this characteristic in travel demand forecasting, but there are limitations regarding the basic aggregation spatial units used in the approaches, for example, the modifiable a...
Article
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Este trabalho investiga o comportamento individual, relativo a viagens encadeadas, para uma amostra de trabalhadores através de participação em atividades e de características socioeconômicas. Além disso, este trabalho propõe a inclusão de características modais agregadas, obtidas através do algoritmo Classification And Regression Tree (CART) e da...
Article
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Using spatial statistics techniques is a way to improve the forecast of travel demand variables considering their spatial dependence. The semivariogram is a proper geostatistic tool for represent the spatial structure of a Regionalized Variable. Therefore, the semivariogram modeling is a fundamental step and is often done visually , based on data k...
Conference Paper
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As campanhas de dia sem automóvel são importantes medidas para a conscientização sobre os impactos negativos do uso intensivo do carro. Este trabalho analisa como as distâncias de viagem estão associadas à opinião, participação e mudança de hábitos em relação ao "Dia sem Automóvel” realizado no campus de São Carlos da Universidade de São Paulo (USP...
Conference Paper
Este estudo propõe o uso do algoritmo CHAID (Chi-square Automatic Interaction Detection) de Árvore de Decisão, como ferramenta de apoio ao gestor, para identificação do público-alvo em campanhas de trânsito a serem veiculadas na mídia. O presente trabalho utilizou uma base de dados abertos de ocorrências de trânsito, do estado de São Paulo (Brasil)...
Conference Paper
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Este trabalho associou características socioeconômicas de usuários de diversos modos de transporte e avaliação destes usuários sobre o Transporte Público (TP) de sua cidade de residência aos fatores que influenciam a utilização do ridesourcing no Brasil. Utilizou-se dados de um questionário online, aplicado no Brasil, para realizar análise explorat...
Article
Full-text available
Traditional methods for travel demand estimation are often built on socioeconomic and travel information. The information required to conduct such studies is costly and rarely available in developing countries. Besides, some conventional methods do not consider the spatial relationship of variables and, in general, a large amount of socioeconomic a...
Article
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Urban dynamics can be characterized more effectively by considering spatial aspects in studies. This paper, using a synthetic spatially correlated data set, aims to model the spatial effect on travel mode choice based on geostatistics precepts. A method was proposed based on three main steps. The first step consists of building synthetic spatially...
Article
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Transport planning depends on modeling variables, and because their collection usually requires high resources, they have limited sampling. However, since they are spatially dependent, the use of Geostatistics in transport demand modeling has proved to be especially convenient, as this tool allows obtaining estimates in non-sampled locations. In th...
Article
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O planejamento de transportes depende da modelagem de variáveis que, em função de usualmente exigirem recursos elevados para a sua coleta, dispõem de uma amostragem limitada. Entretanto, uma vez que apresentam dependência espacial, a utilização da Geoestatística na modelagem da demanda por transportes se mostrou bastante conveniente, já que esse fe...
Conference Paper
Full-text available
Boarding and alighting modeling at the bus stop level is an important tool for the operational planning of the public transport system, in addition to contributing to transit-oriented development. The interest variable, in this case, presents two particularities that influence the performance of proposed estimates: it demonstrates spatial dependenc...
Article
Introduction: Exploratory data reduction techniques, such as Factor Analysis (FA) and Principal Component Analysis (PCA), are widely used in questionnaire validation with ordinal data, such as Likert Scale data, even though both techniques are indicated to metric measures. In this context, this study presents an e-survey, conducted to obtain self-...
Article
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A estimativa de viagens por domicílio é fundamental para a tomada de decisões relativas ao planejamento de transportes. Porém, para obter essa estimativa são necessários dados desagregados dos domicílios, que geralmente são obtidos pela Pesquisa Domiciliar de Origem e Destino. No entanto, a maioria das cidades enfrenta problemas para a aquisição de...
Article
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Among the exploratory spatial data analysis tools, there are indicators of spatial association, which measure the degree of spatial dependence of analysed data and can be applied to quantitative data. Another procedure available is geostatistics, which is based on the variogram, describing quantitatively and qualitatively the spatial structure of a...
Article
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The aim of this article is to propose an alternative approach to disaggregate data using sequential Gaussian simulation, considering the difficulty in obtaining disaggregated data and the fact that these data are more interesting for transportation planning policies. The study area is the São Paulo Metropolitan Area (Brazil), and the 2007 dataset i...
Article
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A modelagem clássica da demanda por transportes ignora um importante aspecto normalmente presente na estrutura das variáveis de interesse: a autocorrelação espacial. Pesquisas recentes reconhecem e incluem tal característica à estimativa da demanda, mas há limitações referentes aos elementos básicos de tratamento utilizados nas abordagens. No intui...
Conference Paper
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Ridesourcing, which is a transportation service based on smartphone applications that connect riders and drivers, has been growing rapidly since it started to offer on-demand services. However, its urban impacts and the factors influencing its use have not yet been adequately addressed. This study aimed to identify the main factors that influence t...
Article
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A caracterização comportamental relativa a viagens é uma questão importante nas análises baseadas em atividades e, comumente, é a variável dependente nos modelos de estimativa de demanda por transportes. A classificação individual, segundo comportamentos relacionados aos deslocamentos, pode ser realizada com dados seccionais, considerando diferente...
Article
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Despite the scientific and technological advances toward road crash prediction models, modelling road crashes in Brazil is a challenging task due to unreliable data and unavailability of essential information. Geostatistical approaches fit into this context as they not only incorporate the spatial factor, but also estimate variables in locations wh...
Article
While high road safety performing countries base their effective strategies on reliable data, in developing countries the unavailability of essential information makes this task challenging. As a result, this drawback has led researchers and planners to face dilemmas of “doing nothing” or “doing ill”, therefore restricting models to data availabili...
Conference Paper
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A pesquisa sobe/desce desempenha um importante papel no planejamento de redes de transporte público. Contudo, esse levantamento demanda elevados recursos financeiros e de tempo, além de uma equipe de profissionais bem treinados para a visitação das linhas de ônibus. Dessa forma, o presente trabalho se valeu da dependência espacial entre as observaç...
Article
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Este trabalho propõe uma análise desagregada de escolhas de destinos para viagens intermunicipais, por meio da aplicação de algoritmos de Aprendizagem de Máquinas - AM (Classification And Regression Tree - CART e Algoritmos Genéticos - AG). Foi utilizada uma Pesquisa OD, realizada pelo Centro de Estudos de Transportes e Meio Ambiente (UFBA), em 201...
Conference Paper
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No intuito de possibilitar o adequado ajuste da oferta frente a variações na demanda por transportes, a modelagem de dados de viagens evoluiu gradativamente até que conseguisse abranger todas as peculiaridades inerentes a essa variável. Entretanto, percebe-se ainda uma carência de trabalhos que mostrem os ganhos proporcionados quando se considera o...
Article
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Road traffic accidents occur daily caused by different factors leading to varying degrees of injury severity. Considering this, many studies have been developed to identify and understand these factors to implement preventive actions. A Decision Tree (DT) is one of the techniques that can generate classifications and predictions by detecting a prio...
Article
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The vehicle fleet in the Ceará state has grown 180% over the last ten years. The growth of the resulting emissions is unknown in view of the expansion of this fleet in the greater Fortaleza Metropolitan Area (FMA). The largest fleet in the FMA is in the Fortaleza city itself, where flex fuel vehicles predominate (∼30%). Flex fuel motorcycles increa...
Article
Apesar dos avanços científicos e tecnológicos em prol dos modelos de previsão de acidentes de trânsito, tal prática é considerada um desafio no Brasil, por motivos como dados não confiáveis ou indisponibilidade de informações. Neste contexto, técnicas de geoestatística se adequam por incorporar o fator espacial e ainda possibilitar a estimação de v...
Article
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OBJECTIVE To carry out a spatial analysis of the occurrence of acts of violence (specifically robberies) in public transportation, identifying the regions of greater incidence, using geostatistics, and possible causes with the aid of a multicriteria analysis in the Geographic Information System. METHODS The unit of analysis is the traffic analysis...
Article
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The main objective of this study is to estimate variables related to transportation planning, in particular transit trip production, by proposing a geostatistical procedure. The procedure combines the semivariogram deconvolution and Kriging with External Drift (KED). The method consists of initially assuming a disaggregated systematic sample from a...
Article
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Conventional analysis of transportation demand is usually carried out using socioeconomic, travel, and land use attributes. Despite the effectiveness on travel demand forecasting, it is important to recognize that alternative approaches have been developed in recent years. Traditional methods, besides considering different explanatory variables, ar...
Conference Paper
Traffic accidents are among the leading causes of death around the world. The causes of its occurrence largely correspond to the human factor. With this, many studies are carried out to examine the main determinants underlying human behavior in traffic and more specifically, risk behaviors. The use of questionnaires to relate personality traits and...
Article
In many Brazilian cities, the most common procedure for planning cycling networks is using aggregated population data in census tracts, which may not take into account the true origin and destination of trips. It may also not identify potential users of a particular mode of transport. This is particularly important considering that implementing cyc...
Article
Traditional trip distribution models usually ignore the fact that destination choices are made individually in addition to aggregated factors, such as employment and average travel costs. This paper proposes a disaggregated analysis of destination choices for intercity trips, taking into account aggregated characteristics of the origin city, an imp...
Article
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Resumo: A análise da dinâmica de desenvolvimento de processos erosivos no entorno das ferrovias são requisitos da legislação ambiental vigente para o setor ferroviário. Em abordagens capazes de subsidiar processos de análise, monitoramento e controle de riscos ambientais, algoritmos de Árvore de Decisão (AD), associados à utilização de sistemas de...
Article
Studies in the field of discrete choice analysis are crucial for transportation planning. Generally, travel demand models are based on the maximization of the random utility and straightforward mathematical functions, such as logit models. These assumptions lead to a continuous model that presents constraints concerning fitting the data. Artificial...
Article
Free flow speed (FFS) is defined in the HCM as the “average speed of vehicles on a given segment, measured under low-volume conditions, when drivers are free to travel at their desired speed and are not constrained by the presence of other vehicles or downstream traffic control devices”. FFS is a very important parameter for the estimation of LOS a...
Article
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p>O Clima Urbano, uma construção social, tende a degradar as condições de conforto térmico das cidades, comprometendo a qualidade de vida de suas populações. Para avaliar e promover o conforto térmico urbano, é necessário utilizar um índice que incorpore tanto as variáveis ambientais como as individuais, e possa integrar e expressar a percepção tér...
Conference Paper
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RESUMO Este trabalho analisou a oferta atual do sistema de transporte intercampi da USP-São Carlos e propôs novos cenários de funcionamento. Conclui-se que o sistema atual supre a demanda existente, porém existe uma demanda potencial caso algumas melhorias fossem implementadas. Assim, foram propostos cenários baseados não somente nos horários de au...
Article
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The main aim of this work is to estimate transit trip production in known and unknown geographic coordinates through kriging with external drift. Thus, the spatial interpolation is performed considering the pair of variable: POPULATION (secondary variable) X TRIP PRODUCTION (primary variable). The data used are from Origin-Destination Survey, perfo...
Article
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RESUMO Esse trabalho tem como objetivo analisar e comparar os resultados de duas técnicas de Krigagem (Ordinária e Indicativa) que foram aplicadas para estimar a escolha do modo de transporte particular motorizado (automóvel ou motocicleta) em coordenadas de valores conhecidos e desconhecidos. Os dados utilizados foram da Pesquisa Origem/Destino e...
Conference Paper
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O objetivo deste trabalho é desenvolver modelos de previsão da condição de pavimentos aeroportuários com uso da técnica de Redes Neurais Artificiais. Foram realizadas 20 simulações, com variação do conjunto de variáveis, do método utilizado, da arquitetura da rede, da função de ativação e do tipo de treinamento, mantendo-se constante a partição do...
Conference Paper
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Este trabalho apresenta um método para previsão de escolha modal de um campus universitário utilizando como ferramenta a regressão logística binomial. Os dados analisados referem-se a uma pesquisa realizada com os usuários do campus da Universidade de São Paulo em São Carlos (Brasil). A partir de variáveis socioeconômicas e que caracterizam os prin...
Conference Paper
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O presente artigo busca analisar a relação entre a oferta de ônibus e a escolha do modo de transporte no acesso aos principais aeroportos do estado de São Paulo (Brasil) por meio da técnica de data mining, conhecida como Árvore de Decisão (AD). O banco de dados utilizado compõe a Caracterização e dimensionamento da Matriz Origem-Destino do Transpor...
Article
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Studies in transportation planning routinely use data in which location attributes are an important source of information. Thus, using spatial attributes in urban travel forecasting models seems reasonable. The main objective of this paper is to estimate transit trip production using Factorial Kriging with External Drift (FKED) through an aggregate...
Article
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Este trabalho apresenta um método sequencial, envolvendo aplicação de Análise em Componentes Principais (ACP) e logit binomial para previsão de escolha por modo de transporte motorizado. A aplicação da ACP permite reduzir o banco de dados multicolinear a componentes não correlacionadas entre si. Tais components são utlizadas, posteriormente, como v...
Conference Paper
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Artificial Neural Networks (ANNs) are mathematical models fed by information contained in a database, which simulate the learning mechanism of the human brain. Thus, the neural network can be understood as an artificial brain that "learns" from a particular information repetitive transmission of examples mapping certain characteristics. It is under...
Conference Paper
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RESUMO A velocidade de fluxo livre (FFS) é definida pelo HCM como a velocidade média dos veículos trafegando em um segmento em condições de fluxo baixo, quando os motoristas têm a liberdade de escolha da velocidade desejada, e não há restrições devido ao tráfego ou dispositivos de controle à jusante. Neste artigo, foram usadas técnicas de Análise M...
Article
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The main objective of this study is to propose a sequential method for spatial interpolation of mode choice for household locations where choices are unobserved based on Decision Tree analysis and Geostatistics. Initially, Decision Tree analysis was applied in order to estimate the probability of mode choice in surveyed households, thus determining...
Article
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O presente trabalho visa apresentar uma metodologia realizada em duas etapas, envolvendo aplicação de modelos não paramétricos (Árvore de Decisão - AD) e paramétricos (Regressão Linear Múltipla-RLM) para previsão de escolha modal. A aplicação da AD permite encontrar relações entre variáveis socioeconômicas e escolha modal, bem como discretizar as v...
Article
Individuals choose the travel mode considering their own characteristics, those of the journey and the transport systems. Despite the current wide availability of georeferenced information an