For instance, larger roundabouts have entry lanes that correspond ... to concern myself with driving on the left?" Well, left-hand traffic countries extend beyond the UK, Australia, and Japan.

Some 76 countries and territories use left-hand traffic, and the practice is believed to have originated in ancient Rome to help defend against enemy attacks. Following is a transcript of the video.

The 99% Invisible podcast has a fascinating story on a country switching from right-hand ... to left-hand drive. Go listen. Högertrafikomläggningen, which translates to "the right-hand traffic ...