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Submitted on: 27 August 2021.
Revised on: 26 September 2021.
Accepted on: 28 October 2021.
___________________Journal of Traffic and Transportation Engineering-English Edition
Submitted on: 28 December 2000.
Revised on: 06 February 2001.
Accepted on: 15 March 2001.
___________________Journal of Traffic and Transportation Engineering-English Edition
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