To practice doing chumros right, choose your own one chumra and train yourself on that. Preferably, a private one and that is not done at expense of others. For example, I am counting how many people I can wave through in front of me in traffic. The reason for this chumra is that people are generally polite when walking and looking at each other faces, even in masks: there are no red light on sidewalks! But if we don’t see faces of drivers, suddenly it is wild west.
Turns out this is not an easy one. Sometimes, I am in a hurry and either forget or feel that my time is more important. Sometimes, I have more kids in a car than the empty school bus I meet – why should I let him. Also, I seem to be doing it better when kids are in the car and I can “teach” them (or really show off?). Also, what do you do when the drivers behind you get annoyed by you slowing the traffic down by letting people in? And what about people who do not understand your blinking to let them in and continue standing – do you wait partently for them or not?