Transport infrastructure can create efficient connections in traffic systems, yet it can also create barriers to movement on a local scale. In transport infrastructure projects there is a need for methods to quantify these barrier effects – also called severance – to assess their impacts on social inclusion, health and viability of businesses.

This paper proposes four local accessibility indicators to measure direct barrier effects: Travel time, Choice, Catchment and Service efficiency. The indicators are tested in a case study where the consequences of placing a motorway and a railway in tunnels are assessed. The results show how local accessibility is affected in non-linear patterns.

The paper contributes to accessibility literature by introducing direct barrier effects as an applied case of local accessibility, and demonstrates the potential of those indicators to quantify barrier effects. Finally, it offers accessibility as a theoretical framework for further developing theories on barrier effects.

运输基础设施可以在交通系统中建立有效的连接，但同时也可能会阻碍本地规模的交通。在运输基础设施项目中，需要一种方法来量化这些障碍效应（也称为遣散费），以评估其对社会包容，健康和企业生存能力的影响。

本文提出了四个本地可访问性指标来衡量直接的障碍影响：旅行时间，选择，集水和服务效率。在案例研究中对指标进行了测试，评估了在高速公路上铺设高速公路和铁路的后果。结果显示了非线性模式如何影响本地可访问性。

本文通过引入直接障碍效应作为局部可访问性的应用案例，为可访问性文献做出了贡献，并展示了这些指标对量化障碍效应的潜力。最后，它提供了可访问性，作为进一步发展屏障效应理论的理论框架。