Why do cars in foreign countries, drive on the left side of the highway? Is this good for traffic?

The direction of travel is an important element of the traffic rules of the world, which stipulates the orientation of vehicles on the road to avoid confusion and accidents. The direction of travel can be divided into two categories: vehicles traveling on the left side of the road and vehicles traveling on the right side of the road. 34% of the countries are traveling on the left side of the road and 66% of the countries are traveling on the right side of the road. In terms of road mileage, 28% of the world's passable roads are traveled on the left and 72% on the right. The biggest advantage of driving on the left comes from a harm avoidance instinct of human beings: when human beings are in fast motion, they will instinctively lean or turn to the left to protect the position of the heart when they find danger in front of them (this is also the reason why the islands of aircraft carriers are located on the right side of the deck, because the instinctive action of pilots is to make a sharp turn to the left when they encounter danger, and the islands are located on the right side of the ship to avoid the pilots from hitting each other when they are in danger during the landing process). (The island is located on the right side of the ship to prevent the pilot from crashing into it during landing). In the case of driving a car and suddenly realizing that there is a danger in front of you, it is much faster to turn left than to turn right. In addition, human vision is usually dominated by the right eye, so the driver's seat is placed on the right side of the vehicle to make it easier to see oncoming traffic. The advantage of right-handedness is that the driver can maintain control of the steering wheel with the left hand while using the right hand to perform complex maneuvers such as shifting gears and operating the instrument panel, which is advantageous to right-handed drivers and, conversely, disadvantageous to left-handed drivers. In addition, right-handedness facilitates bicyclists or motorcyclists to signal turns with their left hand. However, the biggest advantage of adopting the right-hand traffic rule is that this rule is adopted by most countries in the world and drivers who are used to driving on the right do not have to spend time in these countries to familiarize themselves with the new traffic rules. Also the production of cars with the driver's seat on the left side is large, and left-hand drive cars are cheaper than right-hand drive cars of the same model.