Abstract: Motorcycle taxi plays an important role as one of public transportation modes in
Bangkok. However, in the past, the motorcycle taxi service has been operated under
unregulated condition that causes various problems to motorcycle taxi drivers and users. In
2005, the Thai government has imposed the regulations upon motorcycle taxi service that
included motorcycle taxi drivers’ registration and fare rate. This makes Thailand becoming
the first country in the world that regulates motorcycle taxi service. This study examines the
motorcycle taxi drivers and service conditions before and after having imposed the
regulations. The results reveal that the motorcycle taxi drivers’ behavior and its service
system have been changed obviously after the imposition. Also, this study proposes the
equation that could represent the system of motorcycle taxi service which could be applied for
future planning condition perspective.