Robots have been used to remind the public of social distancing measures. In China and US, drones have been deployed to warn / cajole / coerce people. The robot can broadcast public safety messages — from “Please maintain a safe distance between you and other people” to “Excuse me! Please keep 1 meter apart from your friend!” in crowded public places like shopping malls, HDB heartland wet market, supermarkets, departmental stores, hawker centers, parks, etc