Societies aim to reduce primary raw material consumption, enhance waste recycling, and reduce waste disposal. In this regard, the circular‐economy concept has gained attention and is applied in policy papers, also on the urban level. However, to assess set targets and their achievement, a sound knowledge of anthropogenic material flows and stocks is required. The material turnover of transport systems has not been sufficiently investigated yet, although they have a significant impact on overall material turnover and have a high potential for making use of recycled construction materials. To close this gap, the present study investigates the anthropogenic stocks and flows related to an urban transport system, whereby both infrastructure and vehicles are included. A bottom‐up, multiyear material‐flow analysis was employed to calculate the material stock and the related input and output flows of Vienna's transport system for the period 1990–2015. The results indicate the increasing importance of more environmentally friendly modes of transport. The stock of motorized individual transport has increased in absolute terms since 1990, but the stock per capita remains unchanged at 34 t/cap, whereas the per capita stock of public transport (20 t/cap; +8%) and of non‐motorized individual transport (4 t/cap; +10%) has increased. However, the primary source of material consumption (>65%) is maintenance of infrastructure. This provides a potential for more circularity because outputs and inputs are equal in terms of mass and material. The study provides a systematic analysis for developing policy and management options for sustainable resource‐saving urban transport systems.

中文翻译：

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维也纳市运输部门的物料库存开发

社会的目标是减少主要原材料消耗，加强废物回收利用并减少废物处置。在这方面，循环经济概念受到关注，并在政策文件中得到应用，在城市一级也是如此。但是，为了评估既定目标及其实现，需要对人为物质流动和储存有充分的了解。运输系统的物料周转率虽然对整体物料周转率有重大影响，并且具有使用回收建筑材料的巨大潜力，但尚未进行充分的调查。为了缩小这一差距，本研究调查了与城市交通系统有关的人为资源和流量，其中包括基础设施和车辆。自下而上 多年物料流分析用于计算1990-2015年期间维也纳运输系统的物料存量以及相关的输入和输出流量。结果表明，更加环保的运输方式的重要性日益提高。自1990年以来，机动车个人运输的绝对数量绝对增加，但人均库存保持不变，为34吨/人，而公共交通和非机动车的人均存量（20吨/人； + 8％）个人运输量（每吨4吨； + 10％）增加了。但是，材料消耗的主要来源（> 65％）是基础设施的维护。这提供了更大的圆形度的潜力，因为在质量和材料方面，输出和输入相等。