Proximity is an opensource (free) toolkit that enables the development of clear, easy-to-understand and instructive signage to assist social distancing in public space during the Covid-19 pandemic. Check out the example and download the instructions. All you will need is an A4 sheet of paper, tape, paint or chalk.
Proximity is essential and intuitive, designed to be adopted everywhere and applied by anyone, anywhere in the world, with cheap and easy-to-find materials.