Submitted on: 14 February 1998.
Revised on: 24 February 1998.
Accepted on: 04 March 1998.
TRANSPORTATION JOURNAL
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Submitted on: 14 September 2003.
Revised on: 20 October 2003.
Accepted on: 01 November 2003.
TRANSPORTATION JOURNAL
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Submitted on: 31 December 2005.
Revised on: 09 February 2006.
Accepted on: 21 February 2006.
TRANSPORTATION JOURNAL---PENN STATE UNIV PRESS
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Submitted on: 24 March 2022.
Revised on: 02 May 2022.
Accepted on: 19 May 2022.
TRANSPORTATION JOURNAL---PENN STATE UNIV PRESS