Stated preference (SP) surveys typically ask respondents to make a choice under a hypothetical si... more Stated preference (SP) surveys typically ask respondents to make a choice under a hypothetical situation. However, the choice context is often unrealistic, leading to errors and biases in the response. To overcome this, revealed preference (RP) data has been used to create a more realistic choice context for generating SP questions. For instance, in stated adaptation (SA) surveys, users are asked to answer SP questions based on a specific RP context they actually experienced. One challenge in SA surveys is that it is difficult for the respondents to precisely recall the RP context, especially when there is a longer time gap between RP behavior and SP response (response lag). However, no empirical studies have been conducted to test how elicited preferences vary in response to changes in the response lag. This study empirically examines the impact of response lag on SP responses using real-time SA survey data collected from Kumamoto and Hiroshima, Japan. To accomplish this, we develo...
This study attempts to evaluate the effectiveness of a mobility management (MM) measure utilizing... more This study attempts to evaluate the effectiveness of a mobility management (MM) measure utilizing a circulation system of “Green-community voucher” (i.e. a community currency) on encouraging the citizen to shift to public transport. Green-community voucher circulation system collects the funds for developing a solar power plant, and provides discount service for the customers in local shop. The system is expected to contribute both of the revitalization of local stores and the reduction of GHG emission in the region. At the same time, an MM measure has been conducted to make the customers to change their car-use behavior to local stores. About 130 vouchers were sold for the first three months, and about 30% of sold vouchers were consumed. As a revitalization effect of the MM measure, one-third participants highly intended to switch the daily shopping destination from large shopping complexes to local stores. In terms of the impacts on travel behavior, it promoted to switch from priv...
Journal of the Eastern Asia Society for Transportation Studies, 2010
This paper aim to provide additional insights of using a bivariate ordered probit model to simult... more This paper aim to provide additional insights of using a bivariate ordered probit model to simultaneously examine influential factors that affect injury severity (IS) and collision type (CT) of traffic accidents occurring on intersections of national highways in Japan. The effectiveness of the bivariate model is re-confirmed using large-scaled traffic accident data. The corrections between error terms of IS and CT are statistically significant, implying that there are some unobserved factors that simultaneously affect IS and CT, but are not well captured in traditional accident surveys. Six types of collisions are dealt with and their influential factors are examined with respect to both primary and secondary parties. A complicated structure of influential factors is clarified, and it is expected that such complexity cannot be properly captured based on the widely applied cross-aggregation method in practice.
This study first proposes a Multilevel Cross-Classified Logit model with Co-variation (MCCLCV mod... more This study first proposes a Multilevel Cross-Classified Logit model with Co-variation (MCCLCV model) to detect the co-variations which are the var-iations caused by two or more factors jointly, and then applies the model to travel mode choice behavior. In the empirical analysis, focusing on four different varia-tion types (spatial variations, inter-individual variations, intra-individual varia-tions, and co-variations between inter-individual and spatial variations), we first examine the existence of co-variation effects by comparing two models with and without co-variation terms by using Mobidrive data (a continuous six-week travel daily data). Here, the co-variations mean individual-specific spatial effects, proba-bly reflecting the different perceptions for same spaces among individuals. The re-sults indicate that there certainly exist co-variations especially for the utility dif-ferences in Bicycle and Public transport with respect to Car passenger. After that, we further introd...
This paper describes an initial analysis to evaluate the effects of a new vehicle emission standa... more This paper describes an initial analysis to evaluate the effects of a new vehicle emission standard “Decree of The State Minister of Environment of Republic Indonesia No 141 Year 2003” on the ambient air quality in Jakarta City. The decree is enacted to reduce emission loads from mobile sources. This new emission standard will be applied step by step: to new type/new model that launched in 2005 from January 2005, to four-stroke motor cycle (current model that still produced since several years before) from July 2006 and to all models from January 2007. Current and future emission loads are estimated with respect to major roads in the center of Jakarta city. It is found that in the long term, implementation of the new vehicle emission standard will significantly reduce emission loads from gasoline-type vehicles. However, the new standard seems not effective to diesel-type vehicles.
Journal of the Eastern Asia Society for Transportation Studies, 2005
Since the 1960s, JICA (Japan International Cooperation Agency) has been providing assistance in t... more Since the 1960s, JICA (Japan International Cooperation Agency) has been providing assistance in the performance of comprehensive transport planning studies in different parts of the world. A major input to such transport planning studies is the conduct of an HIS (Household Interview Survey) that gathers information on the travel and socio-economic characteristics of the population. These information-rich HIS databases have recently been opened by JICA to researchers. The current study analyzes trip characteristics in relation to socio-economic characteristics of travelers. The analyses are done per city and international comparisons among the 13 cities are made. Possible reasons for similarities and differences among the cities are presented including level of infrastructure development, degree of motorization, demographics, and local culture.
Journal of the Eastern Asia Society for Transportation Studies, 2011
This study attempts to evaluate the effectiveness of a mobility management (MM) measure utilizing... more This study attempts to evaluate the effectiveness of a mobility management (MM) measure utilizing a circulation system of “Green-community voucher” (i.e. a community currency) on encouraging the citizen to shift to public transport. Green-community voucher circulation system collects the funds for developing a solar power plant, and provides discount service for the customers in local shop. The system is expected to contribute both of the revitalization of local stores and the reduction of GHG emission in the region. At the same time, an MM measure has been conducted to make the customers to change their car-use behavior to local stores. About 130 vouchers were sold for the first three months, and about 30% of sold vouchers were consumed. As a revitalization effect of the MM measure, one-third participants highly intended to switch the daily shopping destination from large shopping complexes to local stores. In terms of the impacts on travel behavior, it promoted to switch from priv...
Stated preference (SP) surveys typically ask respondents to make a choice under a hypothetical si... more Stated preference (SP) surveys typically ask respondents to make a choice under a hypothetical situation. However, the choice context is often unrealistic, leading to errors and biases in the response. To overcome this, revealed preference (RP) data has been used to create a more realistic choice context for generating SP questions. For instance, in stated adaptation (SA) surveys, users are asked to answer SP questions based on a specific RP context they actually experienced. One challenge in SA surveys is that it is difficult for the respondents to precisely recall the RP context, especially when there is a longer time gap between RP behavior and SP response (response lag). However, no empirical studies have been conducted to test how elicited preferences vary in response to changes in the response lag. This study empirically examines the impact of response lag on SP responses using real-time SA survey data collected from Kumamoto and Hiroshima, Japan. To accomplish this, we develo...
This study attempts to evaluate the effectiveness of a mobility management (MM) measure utilizing... more This study attempts to evaluate the effectiveness of a mobility management (MM) measure utilizing a circulation system of “Green-community voucher” (i.e. a community currency) on encouraging the citizen to shift to public transport. Green-community voucher circulation system collects the funds for developing a solar power plant, and provides discount service for the customers in local shop. The system is expected to contribute both of the revitalization of local stores and the reduction of GHG emission in the region. At the same time, an MM measure has been conducted to make the customers to change their car-use behavior to local stores. About 130 vouchers were sold for the first three months, and about 30% of sold vouchers were consumed. As a revitalization effect of the MM measure, one-third participants highly intended to switch the daily shopping destination from large shopping complexes to local stores. In terms of the impacts on travel behavior, it promoted to switch from priv...
Journal of the Eastern Asia Society for Transportation Studies, 2010
This paper aim to provide additional insights of using a bivariate ordered probit model to simult... more This paper aim to provide additional insights of using a bivariate ordered probit model to simultaneously examine influential factors that affect injury severity (IS) and collision type (CT) of traffic accidents occurring on intersections of national highways in Japan. The effectiveness of the bivariate model is re-confirmed using large-scaled traffic accident data. The corrections between error terms of IS and CT are statistically significant, implying that there are some unobserved factors that simultaneously affect IS and CT, but are not well captured in traditional accident surveys. Six types of collisions are dealt with and their influential factors are examined with respect to both primary and secondary parties. A complicated structure of influential factors is clarified, and it is expected that such complexity cannot be properly captured based on the widely applied cross-aggregation method in practice.
This study first proposes a Multilevel Cross-Classified Logit model with Co-variation (MCCLCV mod... more This study first proposes a Multilevel Cross-Classified Logit model with Co-variation (MCCLCV model) to detect the co-variations which are the var-iations caused by two or more factors jointly, and then applies the model to travel mode choice behavior. In the empirical analysis, focusing on four different varia-tion types (spatial variations, inter-individual variations, intra-individual varia-tions, and co-variations between inter-individual and spatial variations), we first examine the existence of co-variation effects by comparing two models with and without co-variation terms by using Mobidrive data (a continuous six-week travel daily data). Here, the co-variations mean individual-specific spatial effects, proba-bly reflecting the different perceptions for same spaces among individuals. The re-sults indicate that there certainly exist co-variations especially for the utility dif-ferences in Bicycle and Public transport with respect to Car passenger. After that, we further introd...
This paper describes an initial analysis to evaluate the effects of a new vehicle emission standa... more This paper describes an initial analysis to evaluate the effects of a new vehicle emission standard “Decree of The State Minister of Environment of Republic Indonesia No 141 Year 2003” on the ambient air quality in Jakarta City. The decree is enacted to reduce emission loads from mobile sources. This new emission standard will be applied step by step: to new type/new model that launched in 2005 from January 2005, to four-stroke motor cycle (current model that still produced since several years before) from July 2006 and to all models from January 2007. Current and future emission loads are estimated with respect to major roads in the center of Jakarta city. It is found that in the long term, implementation of the new vehicle emission standard will significantly reduce emission loads from gasoline-type vehicles. However, the new standard seems not effective to diesel-type vehicles.
Journal of the Eastern Asia Society for Transportation Studies, 2005
Since the 1960s, JICA (Japan International Cooperation Agency) has been providing assistance in t... more Since the 1960s, JICA (Japan International Cooperation Agency) has been providing assistance in the performance of comprehensive transport planning studies in different parts of the world. A major input to such transport planning studies is the conduct of an HIS (Household Interview Survey) that gathers information on the travel and socio-economic characteristics of the population. These information-rich HIS databases have recently been opened by JICA to researchers. The current study analyzes trip characteristics in relation to socio-economic characteristics of travelers. The analyses are done per city and international comparisons among the 13 cities are made. Possible reasons for similarities and differences among the cities are presented including level of infrastructure development, degree of motorization, demographics, and local culture.
Journal of the Eastern Asia Society for Transportation Studies, 2011
This study attempts to evaluate the effectiveness of a mobility management (MM) measure utilizing... more This study attempts to evaluate the effectiveness of a mobility management (MM) measure utilizing a circulation system of “Green-community voucher” (i.e. a community currency) on encouraging the citizen to shift to public transport. Green-community voucher circulation system collects the funds for developing a solar power plant, and provides discount service for the customers in local shop. The system is expected to contribute both of the revitalization of local stores and the reduction of GHG emission in the region. At the same time, an MM measure has been conducted to make the customers to change their car-use behavior to local stores. About 130 vouchers were sold for the first three months, and about 30% of sold vouchers were consumed. As a revitalization effect of the MM measure, one-third participants highly intended to switch the daily shopping destination from large shopping complexes to local stores. In terms of the impacts on travel behavior, it promoted to switch from priv...
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