I’ve learned so much from the other answers!
Maybe I should share my experience.
I’m a pediatric oncologist, and have been to Vietnam (mainly HCMC, but also Hanoi, Hue and Danang), mainly to visit my colleagues and hospitals, and often to teach.
I’ve crossed the roads many times; I’m still alive.
One of these road-crossing-staying-alive incident taught me so much.
Some years ago, I was staying in a small hotel near Ben Thanh Market. My colleagues (a fellow doctor, and two senior nurses) were trying to cross the street to the market. We hesitated for some time. Then I saw an old lady who looked like she was also crossing the same road. I smiled at her.
She then walked over to us, and held the hand of one of the nurses, and led her to cross the road, confidently. The rest of the group followed her.
So, I learned an important lesson — SMILE, and you will be LED (safely, and confidently)