Historically, many places kept left, while many others kept right, often within the same country. There are many myths which attempt to explain why one or the other is preferred. About 90 percent of people are right-handed, and many explanations reference this. Horses are traditionally mounted from the left, and led from the left, with the reins in the right hand. So, people walking with horses prefer the right lane, to keep the animal and sword separated. Check out this link you will get to know the historic reasons and hidden
facts behind why some regions travel on the left lane and why some travel on the right lane! Every result is proven! Watch now and get to know why you are riding in either the left or the right lane!
https://www.youtube.com/watch?v=jxD3Htf21mY&t=16s