1, safe. When riding the escalator, stand firm and hold the handrail tightly. Generally, the right hand is stronger, and it is safer to stand on the right and hold the handrail with your right hand.
2. Convenient. Everybody stand on the right, make way on the left, and let some anxious people pass quickly. If there are people on the left and right, and everyone is scattered on the steps, people who are in a hurry behind will not be able to pass quickly. In western countries, people standing on the left are considered rude and uneducated and despised by others.
3. habit. Cars in most countries on earth drive on the right. People on escalators are used to standing on the right.