This paper aims to propose a convenient metric to evaluate the vulnerability of road networks to extreme events in small to medium-sized cities. We present the efficiency of alternative metric, which centers on how obstructions caused by a disaster tends to increase path lengths in the system. A case study was conducted as proof of concept to evaluate the impact of floods on individual modes of transportation in São Carlos, a medium-sized city in Brazil. The results show that walking and cycling tend to be more robust modes in the city while motorized individual transport tends to be more vulnerable and show that longer trips tend to be more vulnerable to floods, evidencing that car-oriented policy can worsen the network’s vulnerabilities. In contrast, compact city planning that encourages walking or cycling for relatively short distances may be more resilient to flooding.

本文旨在提出一种方便的度量标准，以评估中小型城市道路网络对极端事件的脆弱性。我们介绍了替代度量的效率，该度量的重点是灾难造成的障碍如何趋于增加系统的路径长度。进行了案例研究作为概念验证，以评估洪水对巴西中型城市圣卡洛斯的各种运输方式的影响。结果表明，步行和骑自行车在城市中往往是更健壮的方式，而机动化个人运输往往更脆弱，并且表明较长的旅行往往更容易遭受洪水的侵袭，这证明了以汽车为导向的政策可能会加剧网络的脆弱性。相比之下，