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绿色交通是当今世界城市交通发展的趋势,本文首先介绍了绿色交通相关概念及特点,以及实现绿色交通的相关途径;然后从实践绿色交通理念的角度,重点探讨了东莞生态园的绿色交通规划;最后,本文总结了绿色交通规划相关经验及展望。 相似文献
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绿色交通理念下的城市交通可持续发展 总被引:8,自引:0,他引:8
<正>进入21世纪,在可持续发展呼声高涨的大环境下,作为支撑城市运转的城市交通系统应如何实施可持续发展战略,交通界人士开展了一系列研究,研究主要集中在论证城市交通可持续发展内涵和必要性、建构机理模型以及提出基本对策等方面,在系统可持续发展的综合可行性对策方面还未有深层探讨。针对这种情况,本文引入绿色交通理念,旨在从新的视角探索如何切实实现城市交通可持续发展。 相似文献
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交通运输业是国民经济的基础性行业,也是能源消费和碳排放的主要行业之一。文中介绍了江苏省无锡市绿色循环低碳交通工作从起步至今取得的成绩,并总结了无锡市绿色循环低碳研究中心作为工作主体,在强化技术支撑,承担低碳交通与节能减排技术咨询服务工作中的一些经验、存在的问题,以及后续工作的展望。以期为其他城市绿色循环低碳交通工作提供有益的经验及借鉴。 相似文献
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作为一个完整、宽泛的系统工程概念,智能交通不仅涵盖城市交通的智能化问题,而且还包括公路、水路、铁路、航空等交通方式的智能化问题。应当从“大交通”的宏观层面来理解和分析智能交通,用智能交通的基本理念研究基于“大交通”范畴的综合交通体系的智能化的问题。 相似文献
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本文在阐述"环境友好理念"及其与城市交通改善之间关系的基础上,以首尔清溪川、首尔广场和汝矣大道的交通变迁和改善为例,以"环境友好理念"为主线,通过不同时期的交通发展对比,挖掘其中交通改善的策略,期冀对我国城市交通的进一步完善起到抛砖引玉的作用。 相似文献
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This paper considers a signalized street of uniform width and blocks of various lengths. Its signals are pretimed in an arbitrary pattern, and traffic on it behaves as per the kinematic-wave/variational theory with a triangular fundamental diagram. It is shown that the long run average flow on the street when the number of cars on the street (i.e. the street’s density) is held constant is given by the solution of a linear program (LP) with a finite number of variables and constraints. This defines a point on the street’s macroscopic fundamental diagram. For the homogeneous special case where the block lengths and signal timings are identical, all the LP constraints but one are redundant and the result has a closed form. In this case, the LP recipe matches and simplifies the so-called “method of cuts”. This establishes that the method of cuts is exact for homogeneous problems. However, in the more realistic inhomogeneous case the difference between the two methods can be arbitrarily large.The paper uses the LP method to obtain the macroscopic fundamental diagrams arising under four different traffic coordination schemes for streets with four different block length configurations. It is found that the best scheme depends on the prevailing density. Curiously, the popular scheme in which all the traffic green phases are started synchronously wins only in rare circumstances. Its performance is particularly underwhelming when the street’s blocks are long. The paper also presents density-aware numerical methods to optimize the signal offsets for 1-way and 2-way streets. For 1-way streets operated with a common cycle the method reduces to a simple graphical construction . In this case the resulting flow matches the flow that would arise if all of the street’s intersections except one with the shortest green phase had been eliminated. 相似文献
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Giving pedestrians priority to cross a street enhances pedestrian life, especially if crosswalks are closely spaced. Explored here is the effect of this management decision on car traffic. Since queuing theory suggests that for a given pedestrian flux the closer the crosswalk spacing the lower the effect of pedestrians on cars, scenarios where pedestrians can cross anywhere should be best for both cars and pedestrians. This is the kind of pedestrianization studied.Analytic formulas are proposed for a pedestrianized street’s capacity, free-flow speed and macroscopic fundamental diagram. Of these, only the free-flow speed formula is exact. The analytic form of the capacity formula is inspired by analytic upper and lower bounds derived with variational theory for a version of the problem where cars are treated as a fluid. The formula is then calibrated against microscopic simulations with discrete cars. The MFD for the fluid version of the problem is shown to be concave and have a certain symmetry. These two geometrical properties, together with the formulae for capacity and free-flow speed, yield a simple approximation for the MFD.Both the capacity and MFD formulae match simulations with discrete cars well for all values of the pedestrian flux – errors for the capacity are well under 0.2% of the capacity before pedestrianization. Qualitatively, the formulas predict that the street’s capacity is inversely proportional to the square root of the pedestrian flux for low pedestrian fluxes, and that pedestrians increase the cars’ free-flow pace by an amount that is proportional to the pedestrian flux. 相似文献
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