There is a renewed fücus on active modes of transportation given their multiple advantages, whether für human health or the environment in general. Interest has grown especially in 2020 after the COVID-19 pandemic, when several cities quicldy implemented temporary facilities for walking and cycling in the context of physical distancing. Several measures piggyback.ed on existing programs such as the Montreal initiative for complete streets ('rues conviviales' or 'social/festive streets'') that selects streets each year für pilot projects and a final design implementation over a three-year period This resulted in seasonal pedestrianization of about ten streets each year since 2020. Though active transportation brings together pedestrians and cyclists und.er a large umbrella, these users have very different characteristics and tbere may be conflicts of use if mixed in tbe same space. Cycling is thus generally forbidden on pedestrian streets. Despite these rules, there is cycling traffic on pedestrian streets as cyclists also enjoy car-free facilities, especially when pedestrian traffic is low, which generates complaints by pedestrians. To reconcile and help botb categories of users coexist, two Montreal boroughs tried a new rule in the Summer of 2021, to 1et cyclists bik.e at walldng speed on pedestrian streets while avoiding conflicts with pedestrians. There are few studies on cyclist-pedestrian interactions, and, to the best ofthe authors' knowledge, none on interactions in pedestrian streets. This work aims to study the coexistence or cohabitation of pedestrians and cyclists in several pedestrian streets through video-based analysis. Data were collected at several sites and on several days during the Summer of 2021 along three different pedestrian streets, two of them. allowing cycling, to assess how cyclists and pedestrians interact, whether cycling is allowed or not.