East Timor had traffic on the left until 1928, when it changed to the right at the same time as its colonial power, Portugal. During Japanese occupation during World War II driving on the left was imposed, and when the Portuguese returned it changed back to the right. Under Indonesian rule, East Timor changed back to driving on the left in 1976, and continued the practice under UN administration from 1999 and since independence in 2002.
https://en.wikipedia.org/wiki/Right-_and_left-hand_traffic
East Timor had traffic on the left until 1928, when it changed to the right at the same time as its colonial power, Portugal. During Japanese occupation during World War II driving on the left was imposed, and when the Portuguese returned it changed back to the right. Under Indonesian rule, East Timor changed back to driving on the left in 1976, and continued the practice under UN administration from 1999 and since independence in 2002.