Submitted on: 14 February 2000.
Revised on: 13 June 2000.
Accepted on: 12 August 2000.
___________________Journal of Transportation Safety & Security
Submitted on: 07 April 2008.
Revised on: 25 June 2008.
Accepted on: 07 July 2008.
___________________Journal of Transportation Safety & Security
http://reply.papertrans.cn/2/200/19983/19983-33.png
Submitted on: 07 March 2014.
Revised on: 01 July 2014.
Accepted on: 15 August 2014.
___________________Journal of Transportation Safety & Security
http://reply.papertrans.cn/2/200/19983/19983-35.png
Submitted on: 08 March 2002.
Revised on: 02 June 2002.
Accepted on: 23 June 2002.
___________________Journal of Transportation Safety & Security