Mode choice,transport structure and urban land use

A theoretical model of the urban land market is solved to examine the impact of bimodal passenger transportation on equilibrium residential land use. In this model travel to the central business district occurs on a dense system of radial roads or bus routes and a competing system or radial expressways or mass transit lines fed by a subsidiary system of densely spread access streets. Under rational behavior assumptions for households, it is shown that various basic urban forms can result depending on the relative generalized cost characteristics of the competing dense and sparse radial networks. The basic urban forms yield fundamental shapes, differing as to the relative geometry and position of the market areas for the two modes. The standard Alonso-Muth model of unimodal travel and circular urban form is found to result as a special case in several of these cases. American urbanized areas of various sizes and modal mix provide plausible examples for each of the basic forms. The paper concludes with a discussion of the model's implications as a framework for examining optimum urban transport structure and the proliferation of transport routes as a function of urban size.     

Optimal allocation of land to transportation in a non-optimal urban structure

This paper deals with the optimal allocation of land to competing uses, residential and transportation, in a built-up urban structure. The land to be allocated is being produced by an optimal demolition activity of the standing housing stock. The population removed has to be housed on the allocated residential land. Hoyt's sector theory is supported.     

The effects of social heterogeneity on travel patterns: A replication study

This paper examines differences between the U.S. and Australian urban landscape in terms of the relationship between urban structure and the effectiveness of public transportation. A replication study is undertaken that tests the validated hypothesis from a U.S. study that urban travel corridor social heterogeneity reduces patronage of public transportation because of resident concerns with social composition of passengers and effects on the travel privacy dimension. A causal model is identified for the city of Sydney that specifies enogenous and endogenous variables, as per the U.S. study, which affect bus and rail use. Results do not lead to the acceptance of the hypothesized relationship. The presence of social heterogeneity in Sydney travel corridors does not deter residents within the study corridors from using the bus or train for the journey to work, nor do they appear to affect longer term decisions on car ownership. Bus patronage was shown to be dependent on social heterogeneity factors while rail use was associated with car owning households. These results highlight differences in urban spatial structure and travel patterns between Sydney and cities in the U.S. study, and suggest differential effects of changes in urban spatial structure and policy responses.     

论城市规划和管理中的规制和利导原则及其应用

论文认为由于城市中存在大量的负经济外部性,应建立与市场有机结合的一套规则或制度引导城市健康地成长和发展.像市场规制在其他领域一样,城市管理和规划中的市场规制原则为:使私人成本等于社会成本,私人收益等于社会收益.在社会主义市场经济条件下,城市规划者可以通过对自己掌控的、影响城市发展和空间配置的要素的规划来引导城市达到其合理结构.因势利导的原则除了系统性外,还有近远期相结合的原则.论文对规制和利导原则在交通结构和交通定价、土地合理定价与土地利用、城市空间战略、土地利用和交通系统、城市发展与土地供给等方面的应用进行了论述.     

Modeling the density variations of urban land uses with transportation network congestion

Perhaps the single most distinctive character of urban activity that distinguishes it from rural and regional activities is the intensive use of urban land. While the nature of density variations of urban land uses and their associated land rents are well understood, there have been few operational urban models that explicitly address the density variations of land uses. The paper presents a combined land use-transportation model, in which transportation congestion costs on networks of various transportation modes are simultaneously determined with the efficient intensity level of land uses. The procedure uses a nonlinear programming approach within the context of a multicommodity flow/input-output model.     

Effects of urban transportation system change on land prices in the setting of owner-occupied residence

The purpose of this study is to analyze the impact of transportation improvement on the land development process and land price structure in an owner-occupied residence setting. A dynamic model of household and landowner in which the role of land as an asset is explicitly considered is presented, and the process of land development and land price change after the announcement of transportation improvement is investigated. During the period between the announcement and the completion of urban transportation improvement, it is observed that the price of the land that is presently used for agriculture but will be developed in the future is higher than the agricultural land price.     

Income class, modal choice, and urban spatial structure

This paper analyzes the impacts of urban transportation system changes and income changes on the welfare of people and on the urban spatial structure, in a setting where the income level differs between two groups, and two transportation modes compete with each other in a city. It is demonstrated that an improvement in some transport facility will not necessarily increase the welfare level of every household, and, at times decreases the welfare of some households. It also is argued that under particular situations, an improvement in a particular transport mode may produce a contraction in the city size rather than an expansion. Similarly, an increase in income of one group might have an adverse effect on the welfare of another income group as a result of competition in the land market.     

城市街区空间结构低碳化的理论模型

通过分析城市空间结构的内涵,认为"街区"是居民日常出行最为集中的场所,也是形成城市空间结构的基本单元。认为应该从居民的出行需求出发,通过充分分析街区内各功能用地的可达性需求,来发现出行需求内向型的街区用地结构,并以此为指导,建设功能混合型的城市街区,使各功能用地与空间可达性最大效用耦合,从而减少通勤产生的碳排放。     

The effects of transportation system improvements on urban performances with heterogeneous residents

Through developing a spatial equilibrium model for a linear monocentric city with a bi-modal traffic corridor (i.e., highway and public transit), this paper examines the effects of transportation improvements (including the decreases of the fixed travel cost, the travel time and monetary cost per unit distance) on urban spatial structure and the utilities of the two resident classes, namely car-available-residents (CARs) and car-unavailable-residents (CURs). As a result, it is demonstrated that the city size increases with the improvements of vehicle-highway system and the degree of CARs’ travel mode choice rationality, but the improvement of public transit may produce a shrinkage rather than an expansion in city size. From the aspect of utility, both CARs and CURs benefit from the improvement of vehicle-highway system; however, the improvement of public transit might have an adverse effect on the utility of CARs. These findings would provide valuable reference for the future transportation and urban planning.     

土地紧缩政策背景下土地利用问题研究述评——基于城市规划学科的视角

2003年以来国家采取土地紧缩的政策,但城市规划学者对土地问题的关注并不够,很多规划方案难以"落地",研究亦偏重对欧美城市发展模式的借鉴,而对国内体制的剖析不足。从土地权属角度来看,侧重国有土地的规划研究,而忽视集体土地等,这跟国家土地政策走势不太吻合。鉴于此,如何建构一个能促进土地集约利用的机制并构建围绕土地的利益共同体,如何培养一个真正能促进土地集约利用的政府等将是近期亟待研究的重要议题。     

西直门地区交通换乘的主要问题

基于交通枢纽在城市交通系统中举足轻重的作用,选择西直门交通枢纽地区的西直门外地面公交车站、地铁2号线和城铁13号线为代表,通过实地观测和问卷调查的方法,获取能够反映公共交通客流总体特征和调查样本乘客出行特征的基本数据,在此基础上,分析研究了该区不同交通方式换乘中存在的衔接不紧密、换乘距离长、便利性较差的问题,以及由此导致的地面公交车辆进出站交叉相错、等候队列长,人流与车流交叉严重等问题。结合相关规划以及研究该区建设实践,提出了解决该地区公共交通换乘问题的对策。     

城市轨道站点周边交通与土地开发的协调性研究

城市轨道站点周边的土地开发利用一直备受关注,实现站点周边交通系统与土地利用的协调发展对缓解城市交通拥堵,优化城市用地结构具有重要意义,文章基于节点—场所模型对杭州市轨道交通1号线部分站点地区交通与土地利用的协同发展状态进行实证研究,建立站点地区交通与土地协调发展评价指标体系,通过定量分析得出结果,结果显示案例站点地区交通与土地利用协同状态存在差别,最后根据发展现状分析原因并给出促进站点周边协调发展的优化建议。     

The Dangers of Automobile Travel: A Reconsideration

A bstract .   America's reliance on automobile transportation has attracted the scorn of academics for decades. Automobiles, it is said, are dangerous to life and limb, environmentally unfriendly, and wasteful of space and resources. Moreover, say the critics, automobiles produce inefficient individualistic social behavior that balkanizes communities and shatters the otherwise cohesive nature of American life.
This article examines the costs and benefits of U.S. automobile travel from a historic perspective. First, it compares the safety of automobile travel with the horse and steam-powered travel that preceded it. It then briefly addresses the changes wrought by American automobiles in terms of their impact on American life, economics, social mobility, and ecology. It concludes that the dangers of automobile use are substantially lower than the dangers posed by early horse-driven and steam-driven transportation methods, especially in terms of fatalities per mile. It finds that on a per-mile or per-trip basis, automobile travel is safer than virtually any other means of travel used popularly in U.S. history, and that the other contributions of automobile transportation have been seriously overlooked by transportation scholars.     

Urban land use allocation and environmental pollution control: An intertemporal optimization approach

This paper deals with long-run, multiperiod strategies of environmental pollution control and allocation of urban land uses. Air pollution generated by the industrial, residential and transportation sectors is taken as representative of the urban environmental quality problem. A comprehensive urban development optimization model is presented, integrating three submodel components for industrial, residential and transportation activities. The analysis focuses on the intertemporal linkages between technological and locational decisions, accounting for land availability, air pollution generation, control and impact, technological change, relocation of activities, land development and redevelopment, and transportation flows and network expansion. The modeling approach is of the cost-effectiveness type: the efficiency criterion is the total intertemporal cost of urban development and operation, and the objectives of the environmental policy are expressed in terms of standards to be respected. The methodology is illustrated by an empirical application to the Haifa metropolitan area.     

Why do the poor live in cities? The role of public transportation

More than 19 percent of people in American central cities are poor. In suburbs, just 7.5 percent of people live in poverty. The income elasticity of demand for land is too low for urban poverty to come from wealthy individuals' wanting to live where land is cheap (the traditional explanation of urban poverty). A significant income elasticity for land exists only because the rich eschew apartment living, and that elasticity is still too low to explain the poor's urbanization. The urbanization of poverty comes mainly from better access to public transportation in central cities.     

土地政策改革时期的城市空间发展:北京的实证分析

论文探讨北京城市空间发展的特征、并探究空间发展的特征与正在发展壮大的土地市场和土地制度改革之间的关系.利用1993年到2000年上半年北京城市建设区土地使用权出让数据,实证分析显示土地价格及土地开发密度都随着距城市中心区的距离增加呈下降趋势.实证分析还表明地租的曲线的空间变化与土地使用类型相关.这些实证证据支持如下结论:正在形成的土地市场确实影响城市土地开发和空间形态.实证分析还显示地租曲线的斜率和土地-资本替代弹性系数都随着时间的推移而变化.正如城市经济理论所预测,地租曲线斜率的下降是由于北京大量的交通投资降低了交通成本,从而又反过来使城市土地地租空间变化曲线发生旋转.土地-资本替代弹性指数的增加意味着价格影响土地开发密度.这两者的变化都反映出北京的土地市场正走向成熟.应该指出,在土地市场之外(在行政划拨的土地上)进行的大量开发对北京正在形成和发育的土地市场会产生扭曲.     

The social cost of through traffic: Contribution to the suburban-central city exploitation thesis

This paper deals with the conflict between local and through traffic when allocating land for transportation at the expense of residential consumption. The model developed in this paper gives the optimal allocation of land between both uses, via Pontryagin's Maximum Principle, and shows the impact of through traffic on the urban structure, on local transportation costs and on the cost of housing supply. The cost functionals are used to measure the total burden to the inner city and a connection is made to the ongoing discussion of the ‘exploitation’ thesis.     

模糊层次分析法在地铁站火灾风险评估中的应用

随着城市公共交通的快速发展,地铁已成为人们出行的一种重要交通工具,但地铁站火灾近年来时有发生,对地铁站运行过程中的火灾风险进行合理评估是保证地铁安全运行的前提。论文基于模糊层次分析法构建了地铁站运行过程中火灾风险评估模型,并将该模型进行了实际运用。     

Optimal density of radial major roads in a two-dimensional monocentric city with endogenous residential distribution and housing prices

This paper proposes an analytical urban system equilibrium model for optimizing the density of radial major roads in a two-dimensional monocentric city. The proposed model involves four types of agents: local authorities, property developers, households and household workers (i.e. commuters). The local authorities aim to maximize the total social welfare of the urban system by determining the optimal density of radial major roads in the city. The property developers seek to determine the intensity of their capital investment in the land market to maximize the net profit generated from the housing supply. The households choose residential locations that maximize their utility within a budget constraint, and the commuters choose the radial major roads that minimize their individual costs of travel between home and workplace. A heuristic solution procedure is developed to find the urban system equilibrium solution. A system optimum model is also proposed to optimize the density of radial major roads that maximizes the social welfare of the urban system. The proposed model can endogenously determine household residential distribution and land values across the city, along with the housing market structure in terms of housing prices and space. Numerical comparative static analyses of congestion pricing and road infrastructure investment (adding a new radial major road) are carried out together with evaluation of the effects of the service level of radial major roads, urban population size, and household income level on the urban economy.     

La dimension internationale des politiques urbaines dans le Tiers Monde

Urban policics in dweloping countries are subject to both internal and external determinants. As elsrwhere, internal determinants, social relations and conflicts evolve over urbun space. external determinants are not only related to the general mechanisms of dependency, but also to specific modes of intervention by European and North American countries: such as consultancy firms producing urban studies and plans, lateral cooperative organisms, international institutions, suppliers of key materials for urbanization (cars. buses, pipes), training centres for planners and other technicians, etc. All urban policies in the Third World have this international dimension. It has been said that urban sociology has become the sociology of urban policies. In this case, urban sociology of the Third World has become that of the sociology of urban po1icies in their international dimensions, and it can only be done by examining each end of the chain, each side of the system of relations. Neither side can be studied without the. other in understanding and analysing the phenomenon which links them. The urban sociology of the Third World could provide the opportunity to reconsider from new points or departure, the relations between European or North American roeiologists on the anc hand, and Latin American or African sociologists on the other.