I didn't know about Roundabout.

http://ja.wikipedia.org/wiki/ラウンドアバウト

Thank for your tutorial addition. According to the wikipedia note, it is statistically safer. However, there are many kinds of variations of this. For example, dual ones, triple ones, and etc. I am often at a loss which lane I should take when I come into a complex type of roundabout.

Thank you for your comment to my diary.
I'm looking forward my daughter growing up.
Do you have children ?

Oh, thanks for your reply. I think it's better to post in your diary.

Yes, I have a son who is a university student. But I remember the days when he was a baby well. What is interesting, after he left home, he becomes younger and younger in my memory.