Yumiko NAGAI, Atsushi FUKUDA, Yuka OKADA, and Yoshihiko HASHINO analyze the characteristics of two-wheeled vehicle ownership and four-wheeled vehicle ownership in Asia, especially Thailand for both macroscopic and microscopic points of view. The results of their study show that ownership for both kinds of vehicles are highly dependent on income levels. It also shows ownership of two-wheeled vehicles tends to be suppressed in the presence of public transport in the urban area. However, ownership of two-wheeled vehicles increase accordingly with the economic condition of the economic area even if alternative public transportation was introduced.The study is published in the Journal of the Eastern Asia Society for Transportation Studies in 2003.

Abstract: In recent years, the number of registered two-wheeled vehicles has been increasing remarkably in the Asian region. This phenomenon is contributing to the worsening transportation problems such as traffic
accidents, traffic congestion, and air pollution. Since a two-wheeled vehicle owner tends to shift to a four-wheeled vehicle when economic conditions would permit, these various transportation problems might become worst.However, few researches on two-wheeled vehicle ownership in the Asian region have been done. This paper focuses on the analysis of the characteristics of two-wheeled vehicle ownership as well as that of
four-wheeled vehicle ownership in the Asia region, especially in the case of Thailand for both the macroscopic and microscopic points of view. Results show that two-wheeled and four-wheeled vehicle ownerships are highly dependent on income levels. Also, two-wheeled vehicle ownership tends to be suppressed by the presence of public transport in the urban area but it tends to increase accordingly with respect to the economic condition of the local area even though alternative public transportation is introduced.

URL: http://www.easts.info/2003journal/papers/0135.pdf