UK
Japan
Ireland
India
Pakistan
Sri Lanka
Malaysia
South Africa
Australia
New Zealand
A lot.
Anguilla
Antigua and Barbuda
Australia
Bahamas
Bangladesh
Barbados
Bermuda
Bhutan
Bophuthatswana
Botswana
British Virgin Islands
Brunei
Cayman Islands
Channel Island
Ciskei
Cyprus
Dominica
Falkland Islands
Fiji
Grenada
Guyana
Hong Kong
India
Indonesia
Ireland
Jamaica
Japan
Kenya
Lesotho
Macau
Malawi
Malaysia
Malta
Mauritius
Montserrat
Mozambique
Namibia
Nepal
New Zealand
Pakistan
Papua
New Guinea
St. Vincent and Grenadines
Seychelles
Sikkim
Singapore
Solomon Islands
Somalia
South Africa
Sri Lanka
St Kitts and Nevis
St. Helena
St. Lucia
Surinam
Swaziland
Tanzania
Thailand
Tonga
Trinidad and Tobago
Uganda
United Kingdom
US Virgin Islands
Venda
Zambia
Zimbabwe
England
A quick answer would be countries under the influence of the British Empire.
(Those who are under/ where.)
Or, for detail, take Millies answer lol.
Sober? Just go for the center line and do what the other traffic does.(and hope you are not following motorcycles.)
America and canada
http://wiki.answers.com/Q/In_how_many_co...
