With the ratification of the Paris climate agreement to avoid the uncompensated effects of climate change, 197 countries will have to dramatically reduce their greenhouse gas emissions in half by 2030. In the case of the urban space, roads are responsible for the consumption of 105M tons of bitumen and 115M tons of the world’s greenhouse gas emissions. For this reason, the reduction of the environmental impacts of road construction is becoming an urgent necessity. So far the vast majority of the Life cycle assessment (LCA) has been used to evaluate the environmental burdens of existing roads and new asphalt solutions. However, due to the different LCA methodological choices, recent studies have highlighted the difficulties in comparing the results of cases published in literature. Driven by this knowledge gap, the aim of the present study was to identify key aspects missing in the assessment of urban roads. Through a Systematic Literature Review (SLR), 47 publications have been selected for further investigation. An intensive analysis of these documents clearly demonstrate the heterogeneity of the applied LCA methodological choices as well as the selected approaches regarding i.e. the goal of the studies, functional unit, system boundary, database and stratigraphy of the road pavement. Aiming to harmonize the LCA methodology, we have identified key aspects that require solutions for a robust LCA application. The results are expected to be useful for the National Road Administration (NRA) in assessing the environmental impacts of future urban road projects. As a response to the Paris climate agreement targets, the application of harmonized methods regarding LCA should lead to a more robust and structured process in terms of identifying low carbon urban road solutions and contributing to the SDGs respectively.

随着巴黎气候协定的批准以避免气候变化的无偿影响，到 2030 年，197 个国家将不得不将其温室气体排放量大幅减少一半。就城市空间而言，道路消耗了 1.05 亿吨沥青和 1.15 亿吨全球温室气体排放量。因此，减少道路建设对环境的影响已成为当务之急。到目前为止，绝大多数生命周期评估 (LCA) 已用于评估现有道路和新沥青解决方案的环境负担。然而，由于 LCA 方法选择的不同，最近的研究强调了比较文献中发表的案例结果的困难。在这种知识鸿沟的推动下，本研究的目的是确定城市道路评估中缺失的关键方面。通过系统文献综述 (SLR)，已选择 47 篇出版物进行进一步调查。对这些文件的深入分析清楚地表明了所应用的 LCA 方法选择的异质性以及所选择的方法，即研究目标、功能单元、系统边界、数据库和路面地层。为了协调 LCA 方法，我们确定了需要为稳健的 LCA 应用程序解决方案的关键方面。预计该结果将有助于美国国家道路管理局 (NRA) 评估未来城市道路项目的环境影响。作为对巴黎气候协议目标的回应，