Urban areas have been dramatically impacted by the sudden and fast spread of the COVID-19 pandemic. As one of the most noticeable consequences of the pandemic, people have quickly reconsidered their travel options to minimize infection risk. Many studies on the Bike Sharing System (BSS) of several towns have shown that, in this context, cycling appears as a resilient, safe, and very reliable mobility option. Differences and similarities exist about how people reacted depending on the place being considered, and it is paramount to identify and understand such reactions in the aftermath of an event in order to successfully foster permanent changes. In this paper, we carry out two analyses, both from a geographical and temporal point of view: on the one hand, we compare the short-term effects of the pandemic on BSS usage in two French towns (Toulouse and Lyon), and on the other, hand we analyze its mid-term effects in Toulouse. We used Origin/Destination data for 4 years: 2019 (pre-pandemic), 2020 (pandemic before massive vaccination campaigns), 2021 (pandemic after massive vaccination campaigns), and 2022 (year after the pandemic peak). We consider two complementary quantitative approaches. Our results confirm that cycling increased during the pandemic, more significantly in Lyon than in Toulouse, with rush times remaining exactly the same for the 4 years, even during the lockdowns. The year 2021 shows a transitional profile between 2020 and 2022 that could be attributed to adaptation to living with COVID and perhaps also to the increased sense of safety brought by the vaccination campaign. We also found that trip duration during the pandemic situation was longer both on working days and weekends. Comparing BSS traffic with road traffic and public-transport validations shows that cycling is a resilient mode of transport in a pandemic. Among several general observations, we note that peripheral/city center BSS flow is more noticeable in Toulouse than in Lyon and that student BSS usage is more specific in Lyon.

城市地区受到 COVID-19 大流行的突然和快速蔓延的巨大影响。作为大流行最明显的后果之一，人们很快重新考虑了他们的旅行选择，以尽量减少感染风险。对几个城镇的自行车共享系统（BSS）的许多研究表明，在这种情况下，骑自行车似乎是一种有弹性、安全且非常可靠的出行选择。根据所考虑的地点，人们的反应存在差异和相似之处，识别和理解事件发生后的这种反应对于成功促进永久性变化至关重要。在本文中，我们从地理和时间的角度进行了两项分析：一方面，我们比较了疫情对法国两个城镇（图卢兹和里昂）BSS 使用情况的短期影响，另一方面，我们比较了疫情对法国两个城镇（图卢兹和里昂）BSS 使用情况的短期影响。另一方面，我们分析其对图卢兹的中期影响。我们使用了 4 年的始发地/目的地数据：2019 年（大流行前）、2020 年（大规模疫苗接种运动之前的大流行）、2021 年（大规模疫苗接种运动之后的大流行）和 2022 年（大流行高峰后一年）。我们考虑两种互补的定量方法。我们的结果证实，大流行期间骑自行车的人数有所增加，里昂比图卢兹更为显着，即使在封锁期间，高峰时间在四年内也保持完全相同。 2021 年显示了 2020 年至 2022 年之间的过渡情况，这可能归因于对新冠病毒生活的适应，也可能归因于疫苗接种运动带来的安全感增强。我们还发现，疫情期间，无论是工作日还是周末，出行时间都更长。 将 BSS 交通与道路交通和公共交通进行比较验证表明，自行车是大流行病中一种有弹性的交通方式。在一些一般性观察中，我们注意到图卢兹的外围/市中心 BSS 流量比里昂更明显，而且里昂的学生 BSS 使用情况更为具体。