The effects of the recent and still ongoing pandemic have been manifested in several ways across the UK. Deserted streets on a Monday morning does not only signify the sudden stop of most (if not all) activities, but is also a measure of how quickly and effectively local and national authorities managed to spread the message. Road traffic is a fine proxy for economic activity and, while for a direct look onto economic activities we may need to wait for data on monetary transactions, for the traffic, we can enjoy real time coverage. The Urban Flows Observatory, in collaboration with Sheffield City Council, tracks the traffic evolution in the city of Sheffield through a network of 600+ sensors.