How did the left-sided movement?
That if you ride on one side of the road, there will be less congestion, people guessed in antiquity. But which parties adhered to first, it is not exactly known.
But it is known that in ancient Rome, preference was given to the left-sided movement. Most likely, in order for the "combat" right hand to be ready and could always strike the enemy. In addition, to sit on the horse on the left side it was more convenient, since the sword prevented less.
For a long time, people traveled to the left. When the enemy stopped seeing the enemy in each compete, the beginning to take shape right-sided movement
So long time people went to the left. When the enemy stopped seeing the enemy in each compete, the beginning to take shape right-sided movement. This time the reason was physiological. Most people were right-handers, and when driving on a narrow road, it was much easier for them to direct the crew to the right, on the side of the road, and also hold the horses, pulling the entry right, that is, a stronger hand.
One of the first right-hand drive cars
On the first cars, the steering wheel was also on the right. So the driver could go straight on the sidewalk, and not on the roadway. Then the priorities changed, and the steering wheel began to put on the left, to see the driver better. The first mass levicultural car became Ford T.
Today in some countries go on the right side, for example in France, Germany, Italy, USA, Canada. And in the UK, Japan, Singapore, in Cyprus and some others – on the left. But this does not mean that it happened initially.
The United States has moved from left-sided movement to the right side by the end of the XVIII century, after independence from the UK. Motorists of Sierra Leone, Nigeria, Gambia, Ghana and some other former British colonies in Africa moved to the right side for convenience: around them there were "lawyer" former French colonies.