First Author:   Kwok Tong Soo Lancaster University k.soo@lancaster.ac.uk   Department of Economics, Lancaster University Management School Lancaster, LA1 4YX, United Kingdom   +44(0)1524 594418(Phone) +44(0)1524 594418(Fax) Second Author: Ching-Fu Chen National Cheng Kung University cfchen99@mail.ncku.edu.tw   Department of Transportation and Communication, National Cheng Kung University, 1, University Rd. Tainan, 701, Taiwan   +886-6-2757575 ext. 53230(Phone)