After the first COVID-19 wave, the end of the first lockdown represented a window of opportunity to develop vélomobility and to reallocate car space. In this context, Geneva and Lausanne implemented new, pop-up cycle infrastructures that came to be known as ‘COVID cycle lanes’. While such processes were time-specific, local authorities seem to have learned new ways of intervening and experimenting with public spaces in terms of temporary urbanism. It is worth noting, however, that most other Swiss cities did not take such measures. First, this chapter analyses how and why Geneva and Lausanne played tactically with the legal framework in order to implement COVID cycle lanes. We identify the conditions that made such measures possible (urgency, the low quality of existing cycling infrastructures, ‘political champions’, and a desire to develop cycling). We then turn to the way the new cycle lanes were received, including oppositions (mainly from right-wing conservative milieus, car lobbyists, and retailers). Finally, we analyse the reasons for which other cities—such as Lucerne and Zurich—did not implement such measures, despite demands from some local organizations and politicians.