城市道路立交方案设计

从交通量、周边路网分析、用地性质、交通疏解等影响因素出发,理论上论述了城市道路立交的方案选择,同时结合长沙市湘府路湘江大桥工程两岸接线立交的工程实际案例来论述城市道路立体交叉的设计与优化。     

湖北省城市竞争力比较及其分析

采用AHP层次分析法,利用Excel对反映湖北省12个主要城市的城市竞争力的19项指标进行数据处理与分析,得出其竞争力的综合分值及排名,并对湖北省各地区城市作综合评价。     

CO2 emissions in relation to street-network configuration and city size

The street-network efficiency of tens of British cities in relation to transport fuel consumption and CO₂ emissions are analyzed. The results show a strong linear positive correlation between length entropy and average street length, and a negative correlation between entropy and street density. Also, the results suggest that in a large city the street network is used more efficiently than in a small city, as indicated by the sublinear relations between city size (population) and the number of streets, total length of streets, and the area covered by the street network. The sublinear relation means that these parameters grow more slowly than the city size. By contrast, because a larger fraction of the street network is used at close to full capacity during considerable part of the time in a large city than a small one, the fuel consumption and the CO₂ emissions show a linear relation with city size and superlinear relation with total street length. The superlinear relation means that the CO₂ emissions increase faster than the total street length, a measure of the network size. Thus, large cities may be less energy efficient and environmentally friendly than small cities. In every city the street network needs to interconnect all the buildings, which requires a certain minimum size. In a small city, however, the network is used to a low capacity most of the time so that its relations to fuel consumption and the CO₂ emissions are more favorable than those in a large city.     

Spatial Transferability and Updating Analysis of Mode Choice Models in Developing Countries

ABSTRACT

This article examines the spatial transferability of mode choice models in developing countries. An evaluation of the updating procedure and sample size are also included in the study. Because of the insufficiency of model coefficients in explaining differences in unmeasured modal attributes, naïvely transferring a model is not recommended. An understanding of the transport characteristics in both the estimation context and the application context is required, in order to justify whether a variable is transferable or not. Four updating procedures – updating alternative specific constants (ASCs), updating ASCs and scale parameter, the combined transfer estimator and Bayesian updating associated with three sets of small sample sizes – are applied to improve transferability. In general, the first three approaches produce significant improvements. It is also proposed that a minimum small sample size of 400 observations is necessary for updating purposes.     

大型市政工程施工期间的交通组织与管理——以乌鲁木齐市“田”字形道路建设为例

大型市政工程施工期间,改变了城市道路原有的交通和行车环境,易导致交通拥堵、通行能力下降、安全事故等发生,项目建设前应进行施工期间的交通组织研究分析并优选方案,才能有效地保障施工期间城市交通的良性运转。结合实际案例,着重探讨交通组织及管理措施,可为此类工程建设提供参考。     

桂林交通现状·意识形态·公交优先

该文通过对桂林交通现状的描述,表明现在城市交通拥堵已日趋严重,要想很好地解决城市交通拥堵问题,目前已是关键时期。解决城市交通问题应建立科学的意识形态,只有在科学意识指引下才能做出科学的决策。公交优先已成为老生常谈,而如何将这一思想变成政策并付诸实践,这才是解决问题的关键。接着,根据历年的工作体会并结合大量城市交通现状调查的成果,提出若干条保证公交优先的基本措施,可供决策层在解决城市交通拥堵问题时作参考。     

道路线形安全评估的模糊评价方法探析

通过对道路线形提出了一些评价指标,选取了一条典型道路—淮安市黄河路进行线形的安全性评价。在分析了道路线形的各要素对交通安全影响的基础上,建立了一套评判道路线形安全性的综合评价体系,并利用模糊综合评价的方法建立评价模型,对黄河路段的线形安全性做出评价。最后根据评价的结果,发现黄河路段存在的线形问题,并对其进行改进和优化设计。     

天津临港工业区与海滨大道相交节点交通分析

该文对天津临港工业区的交通出行需求进行了分析,阐述了环绕渤海的海滨大道对临港工业区交通出行的重要性,并对临港工业区主要出行道路与海滨大道相交的各个节点进行了详细介绍,论证了海滨大道的建设与临港工业区交通需求的相互依托关系,实现了区域交通与过境交通的分离。     

从宁波明州大桥看BT项目投资的风险控制

BT项目投资模式是一种新兴概念,虽然形式比较单纯,同时也存在很多缺陷,尤其是风险问题,譬如政府信用风险、项目控制风险、金融风险等等是BT项目投资必须面临的风险。该文以宁波明州大桥为例就诸类风险进行了初步分析,并提出了相应的控制措施。     

城市新区绿色交通实现路径研究--以南通市中央创新区为例

将南通市中央创新区作为城市新区的研究实例,在多维度探讨城市绿色交通体系理念内涵的基础上,重点研究了两个方面的内容,分别是绿色交通在城市新区中的应用价值和城市新区绿色交通的实现路径。从城市绿色交通体系的理念出发,明确城市交通绿色化升级的实现路径,提炼针对城市新区的实施性策略,为丰富和补充城市绿色交通发展理论体系和相关方法论提供思路。