Accounting for accidents in the measurement of transport inefficiency: a case of Taiwanese bus transit
by Erwin T.J. Lin, Lawrence W. Lan
International Journal of Environment and Sustainable Development (IJESD), Vol. 8, No. 3/4, 2009

Abstract: Conventional data envelopment analysis (DEA) measuring transport efficiency (or inefficiency) has impractically assumed that accidents are freely disposable. The present paper attempts to rectify this impractical assumption by proposing directional output distance function models into which different types of casualties are factored. The core logic is to convert different types of casualties – fatality, heavy injury, light injury, property loss – to an aggregated accident index and then to incorporate the index into the DEA modelling. The Taipei bus transit system was investigated. Our results show that the inefficiency scores as well as the number of efficient bus firms with and without accounting for accidents have significant difference. Based on the results, the inefficient bus firms should not merely increase their desirable outputs; they should also improve the safety records so as to improve the technical efficiency.

Online publication date: Mon, 13-Apr-2009

The full text of this article is only available to individual subscribers or to users at subscribing institutions.

Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.

Pay per view:
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.

Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Environment and Sustainable Development (IJESD):
Login with your Inderscience username and password:

    Username:        Password:         

Forgotten your password?

Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.

If you still need assistance, please email