The leader of the Samoa Democratic United Party, Asiata Sale'imoa Va'ai, has called on the government to hold a referendum over its plans to change to right hand drive vehicles.
The switch has been proposed to allow for cheaper vehicles to be sourced from New Zealand and Australia.
The change is planned for July 2008 but it has caused big disappointment to many local car dealers, rental car companies and the Chamber of Commerce.
The SDUP leader says the move will impact on businesses and individuals if the proposed legislation goes through parliament before the end of the year.
But in the face of the criticism, the Transport Control Board has said left hand drive vehicles may continue to be used after July.