Social Distancing App

Would people use an app/function that helped them obey social Distancing rules as well/instead? If say yours and their mobile device buzzed when you were too close for 10 seconds or more prompting you to move away. Allow you to add family phones and a home location. Probably no need to collect data and phones would only be temporarily noting the unique identifier of the other phone.

I could sit in a park and not be too close to someone, I could stand talking to someone at a safe distance for a longer time, go for a cycle/walk with others and know we are minimizing risks while doing so.

It would give people simple support to obey rules while we adapt to a new normal.