Driving on the left
Below is a list of countries currently driving on the left. You'll notice plenty of them were not formerly part of the British Empire. Also, it's worth pointing out that there are plenty of territories that were once part of the British Empire who drive on the right - America, for example
Anguilla, Antigua, Australia,
Bahamas, Bangladesh, Barbados, Bhutan, Botswana, British Virgin Islands, Brunei,
Cayman Islands, Channel Island, Cooke Islands, Cocos Island, Cyprus,
Dominica,
Fiji,
Granada, Guyana,
Hong Kong
India, Indonesia, Ireland, Isle of Man,
Jamaica, Japan,
Kenya, Kiribati,
Lesotho,
Macao, Malawi, Malaysia, Malta, Mauritius, Montserrat, Mozambique,
Namibia, Naunu, Nepal, New Zealand, Norfolk Islands,
Pakistan, Papua New Guinea, Pitcairin Island,
St.Helena, St.Kitts and Nevis, St.Lucia, St.Vincent, Seychelles, Singapore, Solomon Islands, Somalia, South Africa, Sri Lanka, Suriname, Swaziland,
Tanzania, Thailand, Tonga, Trinidad and Tobago, Turke and Caicos Islands,
Uganda, United Kingdom,
Virgin Islands (U.S.),
Zambia, Zimbabwe
End or irrelevant side note!