3 ms·

Sweden did exactly that in 1967.

• darrenf 8y ago
  As well as the fact that their neighbours drove on the right, the argument was made that switching sides would reduce accidents due to Swedes mostly owning left-hand drive cars. There were fewer accidents initially, but things returned to historic levels pretty soon thereafter: https://en.wikipedia.org/wiki/Dagen_H https://en.wikipedia.org/wiki/Dagen_H
• Cyph0n 8y ago
  Samoa did the opposite in 2009. The main reason was to have easier access to the (relatively) nearby Australian vehicle market.