The built environment and vehicle ownership modeling: Evidence from 32 diverse regions in the U.S.

Vehicle ownership is an important determinant of the travel demand forecasting process. Vehicle ownership models are used by policy makers to identify factors that affect vehicle miles traveled, and therefore address problems related to energy consumption, air pollution, and traffic congestion. For the conventional travel demand forecasting, it logically follows land use forecasting, before trip generation, which is commonly treated as step one. The most critical limitation of the vehicle ownership models, especially in the conventional process, is that they are often related mainly to sociodemographic variables, not so much to built environmental variables. In this study, by pooling regional household travel survey data from 32 diverse regions (almost 92,000 households) of the U.S., and by controlling for socio-demographic and the built environmental variables, we estimated a vehicle ownership model that contributes to the understanding of vehicle ownership and improves the accuracy of travel demand forecasts. Two main findings of this research are: 1) The number of vehicles owned by a household increases with socio-demographic variables and decreases with almost all of the built environmental variables. For the urban planning and design practices, this finding suggests that car shedding occurs as built environments become more dense, mixed, connected, and transit-served. 2) We used both count regression and discrete choice models, and the results suggest that count regression models have better predictive accuracy. The model developed in this study can be directly used for travel demand modeling and forecasting by metropolitan planning organizations.     

Occupancy,oil prices,and stock returns: Evidence from the U.S. airline industry

This paper examines whether occupancy of seats affects stock returns of airline companies and how this relationship is affected by WTI oil prices. Our approach combines revenues (occupancy) and costs (oil prices) for 33 U.S. airline companies from 1990 to 2019. Using travel capacity utilization data from U.S. carriers at monthly frequency and exploiting fixed-effects regression models, we document a positive relation between occupancy and stock returns, which is attenuated by oil prices. The role of oil becomes larger with asymmetries: the effects of oil prices are higher when moving up than down. Airline stocks always respond by more than the overall stock market.     

Impacts of two-scale urban form and their combined effects on commute modes in U.S. metropolitan areas

This study explores the relationship between urban form at the metropolitan and neighborhood scales and the percentages of four individual modes to commute. It then looks at the combined effects of urban forms at the metropolitan scale in metropolitan areas in the continental United States using multi-level regression models with interactive terms between urban forms. This study contains the percentages for four commute modes: percentage of the vehicle (VT), public transit (PT), biking (BI), and walking (WK). As urban form factors, this study contains urban fragments, population density, job-resident balance (JRB), the percentage of green areas at the metropolitan scale, and distance to the nearest job center at the neighborhood scale. The results show that at the neighborhood scale, a farther distance from individual neighborhoods to the nearest job center is associated with higher VT, and lower PT, BI, and WK. At the metropolitan scale, urban form factors have a more significant association with the percentage of individual modes to commute in large MSAs compared with small MSAs in terms of population. Most urban form factors at the metropolitan scale are not independently associated with the use of commute modes, but their interactions are associated with the percentage of individual modes to commute. Particularly, the level of urban fragments and the percentage of green areas may transform the impact of high population density and JRB on the percentage of the individual modes to commute except for WK. This study provides planners and policymakers with important guidelines to establish combined urban form plans rather than single urban form oriented plans to reduce vehicle travel.     

美国天主教徒生育限制革命:1960-1975

本文以 196 0 - 1975年间美国社会广泛存在的节育行为的世俗化为切入点 ,探讨美国天主教徒在生育限制领域里对教会教义的反叛 ,并就天主教会权威受到的冲击进行分析和评价 ,以说明宗教世俗化的不可避免。     

Restoring tourist confidence and travel intentions after disasters: some insights from a rejoinder to a series of unfortunate events in Malaysian tourism

Many countries face a decline in tourist confidence and reduced travel intentions after disasters. However, Malaysia – a country that experienced a series of aviation tragedies throughout 2014 – encountered an overall increase in inbound tourists and monetary receipts. This article more closely examines the effects of these unfortunate events on Malaysian tourism and identifies several strategic avenues that can contribute to restoring tourist confidence and reigniting tourist interest in travelling to disaster-stricken countries.     

Does the built environment make a difference? Additional evidence from the daily activity and travel behavior of homemakers living in New York City and suburbs

Homemakers, unlike employed people who have jobs and unemployed people who are seeking jobs, are a special group who do not have to spend time working out of the home, commuting to work, or looking for a job. Given that a regular job typically takes 9 h (This includes an assumed half-hour one-way commute time.) a day, the discretion to allocate their time is presumably much greater than other groups.In this paper, we focus our attention on homemakers’ activity and travel behavior in neighborhoods with different characteristics (e.g., very dense areas, dense areas, and suburbs). The question to be answered is quite simple: are there differences between travel behaviors of homemakers living in different types of neighborhoods? If yes, can these differences be attributed to differences in the built environment?The dataset used in the study is the Household Interview Survey (HIS) collected in 1997/1998 in the New York metropolitan area. We found significant differences in activity and travel related behavior by homemakers living in different types of neighborhoods. Compared to suburban homemakers, New York City homemakers spend more time on discretionary activities and less time on maintenance activities; use public transportation and walk more frequently; and conduct fewer trip chains. The study found that both individuals’ socio-economic characteristics and built environment appear to play a role in explaining behavior. A probably more important factor in explaining people’s time use behavior is the interrelationship between activities and trips, and between different types of activities.     

Market clustering and performance of U.S. OD markets

We segment the U.S. OD markets into peer groups, using a statistical cluster analysis on OD city-pair data on the basis of market concentration, passenger volume and yield. The results show: 1) that high yield markets have, on average, consistently underperformed the industry in both passenger and revenue growth, whereas low yield markets have led the industry in both areas; and 2) mid-sized ODs have experienced higher average growth and lower volatility than the largest U.S. domestic ODs, which have accounted for the least revenue per passenger as compared to all other market types. Financial portfolio analysis indicates the prospect of long-term decision making based on OD market risk and return rather than the aggregated market share analysis used by airlines today.     

Re-evaluating the impact of urban form on travel patternsin Europe and North-America

The work by Newman, Kenworthy and colleagues on the link between land use, transportation systems and travel patterns and energy use has been received enthusiastically but also criticised strongly. In this paper concerns are expressed about the role accorded to individual travellers and the wider space-time context of cities in the empirical-analytical work by Kenworthy and colleagues. To investigate the seriousness of these concerns, the data collected by Kenworthy and colleagues for European, Canadian and US cities in 1990 have been augmented with information on housing, urban development history and the sociodemographic situation. Regression models are described in which the role of urban form is investigated while account is taken of other relevant factors. The empirical analysis suggests that the space-time context of cities should be taken into account in aggregate-level comparisons of the relations between urban form and transport. Policy recommendations based on the original data may be reconsidered and tailored to the space-time context and population characteristics of cities.     

美国铁路管制的由来和发展：历史和思路

回顾并评析1887年以来的美国铁路管制历史,认为美国铁路放权改革经验值得总结。     

Accessibility,mobility, and realized travel behavior: Assessing transport disadvantage from a policy perspective

Limited accessibility and mobility can result in decreased quality of life and well-being, as well as social exclusion. In the United States (U.S.), rural and small urban communities suffer from transport disadvantage due to a lack of transit and a low density of employment, education, recreation, and other opportunities. While the international literature has produced a number of methods and frameworks to assess transport disadvantage and its impacts, the U.S. has lagged behind in providing pertinent studies. The objective of this paper is to establish comprehensive measures that can support the identification, evaluation, and quantification of transport disadvantage in U.S. rural and small urban communities, considering both data availability and the unique characteristics of the U.S. The concept of transport disadvantage in this paper denotes the disadvantage of a specific population group or area that results from a difficulty accessing transportation and/or opportunities. To achieve this objective, this paper develops a spatial multi-perspective approach to account for the three essential elements of transport disadvantage: accessibility, mobility, and realized travel behavior.The developed approach provides an assessment of transport needs and need gaps that can be of benefit to small urban and rural communities and their planning practices, as well as to transport providers. The analysis in this paper suggests that—from a policy perspective—a combination of measures that account for all three essential elements of transport disadvantage should be considered, because the results of each measure complement those of the others. This paper illustrates the proposed approach using a case study of Indiana. The findings suggest that a great part of rural and small urban Indiana presents a low density of opportunities and that transport-disadvantaged residents of such areas might experience the impacts of low transit supply as well. In addition, the findings suggest that residents of rural and small urban areas travel longer distances on their day-to-day activities.This paper attempts to advance the national research pertaining to transport disadvantage and provide a framework that can support planning and policy decisions at the community as well as at the state level.     

A methodology for prioritising HSR corridors: from U.S. theory to Spanish practice

The assessment of methodologies to prioritise the construction of new high-speed rail (HSR) corridors has recently become a key issue for transport planners in countries like the U.S., where HSR does not exist. In a climate of financial instability since the onset of the global crisis of 2007–2008, support for new projects is being eroded by serious concerns over the extremely steep costs of high-speed rail, and there is a need for the scientific clarification of the procedure for prioritizing construction.In 2009 a new ranking methodology was developed and applied to 30,000 city pairs in the U.S. to determine their suitability for high-speed rail investment. The existing literature on ranking tools for prioritising HSR corridors is practically non-existent, and, as none of these U.S. lines has been built or put into in operation, this methodology has not been validated. The main aim of this paper is to contribute to these ranking models and highlight their importance in the HSR planning process. The preliminary ranking tool described in this work has been validated using data from the current HSR Spanish network. The results confirm the consistency of the model as a first approach to ranking pairs, mainly for the top O–D relations; however the model has some drawbacks chiefly due to the type of variables used, and their assigned weightings. Finally, some specific improvements are proposed for this ranking approach in order to provide policymakers with a useful tool when planning the construction of new HSR networks.     

Revenue and operational impacts of depeaking at U.S. hub airports

Historically, peaked schedules have been used with hub-and-spoke networks to maximize passenger connection opportunities. Although peaked schedules can generate more attractive connecting itineraries and revenue for an airline, they are costly to operate because additional manpower and equipment resources are needed to serve the peak periods. Several airlines experimented with depeaking their hubs as a way to reduce costs and improve operations in the 2000s. Prior studies have quantified operational improvements and cost savings associated with depeaking; however, none have quantified revenue impacts. We use difference-in-differences methods to quantify revenue and operational impacts associated with depeaking for five U.S. hubs. Results show that depeaking tends to improve operations, but may negatively impact revenue per available seat mile (RASM). In some cases, revenue losses exceed reported cost savings.     

美国保险业的发展状况及未来展望

美国是世界上保险业最发达的国家之一 ,拥有全球最大的保险市场。保险业在美国经济社会发展中发挥着巨大作用。美国保险市场呈垄断竞争格局 ,创新活动十分活跃。美国的保险监管主要由各州负责 ,并以偿付能力监管为重点。为促进保险业的发展 ,美国政府给予了一系列政策支持。未来若干年 ,美国保险业将在跌宕的环境变化中谋求进一步的发展 ,并继续在世界上保持领先地位。     

Airport security and screening satisfaction: A case study of U.S.

The study analyzes the perception of airport safety by travelers, and how it is related to satisfaction with passenger screening experiences and the perception of public transit safety. It uses the Omnibus Household Survey data collected by the U.S. Bureau of Transportation Statistics and estimates a structural equations model. It finds a positive relationship between Screening Satisfaction and Screening Safety and a positive relationship between the perception of Public Transit Safety and Screening Safety. A lack of experience with using public transit is also found to contribute to travelers perceiving lower levels of Screening Safety at airports, and females compared to males perceive a lower level of Screening Safety. Finally, the study finds causality from a traveler’s satisfaction with the screening process to safety perception.     

Work,travel and home: a study of remembrance activity

A quantitative study conducted in the Australian regional city of Ballarat resulted in a sample which had a high proportion of people with a personal connection to war and remembrance through family. This connection was reflected in higher levels of visitation to local, state and overseas war memorials. A factor analysis suggested that some kinds of remembrance could be grouped into a three part structure based upon creative activities of Work such as writing history, volunteer and paid military work and collecting, Travel to overseas and domestic memorials and informal appreciation of artefacts at Home. The Home group represents the most frequent form of remembrance, practiced at a social scale and which results from the creative activity of individuals. The study therefore supports the notion that individual and social remembrance and memory are closely linked and can be identified with patterns of travel. A potentially large group of people who appeared to have little interest in war remembrance was also identified.     

Spatial and operational factors behind passenger yield of U.S. nonhub primary airports

Nonhub airports are an essential component in the National Plan of Integrated Airport Systems (NPIAS) of the United States in that they connect regional towns and small communities to the air transportation network. Understanding the interplay of operational and spatial factors in determining average passenger yield of nonhub airports provides airlines with valuable information for network planning and revenue management. This study examines factors contributing to the yield variation among nonhub airports in the U.S. Using ordinary least squares (OLS) based econometric models, this study captures the spatial dependence of passenger yield of nonhub airports, which tends to increase with a corresponding increase in distance to the nearest large hub airport. Nonhub airports surrounding large hub airports with higher passenger enplanements and higher average yields also have higher yields than other nonhub airports. In addition, this study finds the effect of Allegiant Airlines in lowering the average passenger yield of the nonhub airports served directly by the airline, which can be termed as ‘Allegiant Effect’. Findings of this study could provide valuable guidance for airlines to analyze network planning strategies and to identify future markets for growth and for policymakers when allocating resources to communities relying on these nonhub airports.     

Comparison of major air freight network hubs in the U.S. and China

The increase in global economic connectivity spurred by ties between Chinese manufacturing and a global market, particularly in high value low weight goods, pushed establishment of air cargo networks. These remain under-examined but impactful particularly for second and third tier metropolitan hub cities. This research looks at the air freight connections within China, a major rapidly developing trade center, and use of the aerotropolis concept to accelerate growth in the lagging inland region. References are made to FedEx and UPS networks within their U.S. headquarter region and in China to note differences in political economic contexts and China’s adaptation of developed world models. The theoretical framework includes global production networks strategically coupled by transport logistics linked to aerotropolis type development. Data comes from government aviation and transportation sources, research analyses, corporate and industry reports, and interviews with Chinese officials. Focus falls particularly on Zhengzhou, capital of Henan Province in central China and the country’s first airport-centered economic zone. The conclusion finds that Chinese hub cities more closely correspond to major manufacturing and population centers and central policy directives for development dispersion.     

Dependence between travel distance,individual socioeconomic and health-related characteristics,and the choice of the travel mode: a cross-sectional study for Kaunas,Lithuania

The aim of this study was to analyse the associations between individual socioeconomic and health-related characteristics, travel distance, and the choice of different travel modes in urban population. A cross-sectional study included 932 adults of Kaunas city, Lithuania. The choice of the travel mode and individual characteristics were self-reported by the participants, and their travel routes were calculated using the geographic information system. Multivariate logistic regression was used to assess the most significant factors determining the choice of a car, cycling, walking, or public transport. In total, 529 participants reported using a car, of whom 65.8% had medium or high education levels. These participants were more likely to be younger, male, married, and employed. Among bicycle users, statistically significant differences between the employment status, body mass index, and travel distance were observed. Walkers were significantly more likely to be older, those with lower incomes, unemployed, and travelling the shortest distances. The analysis of the travel distance on the choice of the travel mode revealed that men travelled longer distances with a car compared to women. The employment status was significantly associated with travel distance by car or public transport. Employed individuals travelled longer distances by public transport or by car, compared to unemployed individuals. Among bicycle users, we found that people with higher levels of education and overweight individuals cycled the longest distances. Our study emphasizes the importance of considering different individual characteristics when analysing the choice of transport modes. It provides evidence that is relevant for all urban populations on the choice of the transport mode, particularly considering active versus passive transport.     

Spatial and temporal transferability of relationships between travel demand,trip cost and travel time

The paper draws together results from several major revealed preference (RP) and stated preference (SP) data sets, collected for large-scale disaggregate models and VTTS research, respectively, to comment on trends which appear in time and cost trading as between different time periods and different countries.     

Ecotourism from a conceptual perspective,an extended definition of a unique tourism form

The aim of this article is to develop and present an extended definition of the concept of ecotourism, which has been used and misused in many ways. Ecotourism is not farm tourism, nature tourism or adventure tourism, but a unique tourism form that has become very popular due to the greening of markets, increasing knowledge of the fragility of the environment, better informed managers, and the recognition that there is a close relationship between good ecology and good economy. Ecotourism has been defined in many different ways in the literature, but one of the most central dimensions, co‐operation, has not been included. Ecotourism must be sustainable and four central groups of actors have to co‐operate, the local people, the authorities, tourists and companies involved in tourism. The understanding of what ecotourism is and stands for is very diverse and the discussion found in Finland is used as an illustrative case in this article. The general view in Finland is that sustainable tourism should be used instead of the concept of ecotourism. A position, which can cause large problems for the development of ecotourism in Finland. Copyright © 2000 John Wiley & Sons, Ltd.