Submitted on: 13 March 2011.
Revised on: 08 April 2011.
Accepted on: 16 April 2011.
TRANSPORTATION JOURNAL---PENN STATE UNIV PRESS
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Submitted on: 07 July 1998.
Revised on: 16 July 1998.
Accepted on: 23 July 1998.
TRANSPORTATION JOURNAL
Submitted on: 25 May 2022.
Revised on: 29 June 2022.
Accepted on: 06 July 2022.
TRANSPORTATION JOURNAL---PENN STATE UNIV PRESS
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