Submitted on: 07 June 2008.
Revised on: 14 July 2008.
Accepted on: 08 August 2008.
TRANSPORTATION JOURNAL
Submitted on: 13 March 2006.
Revised on: 22 April 2006.
Accepted on: 08 May 2006.
TRANSPORTATION JOURNAL---PENN STATE UNIV PRESS
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Submitted on: 05 November 2017.
Revised on: 15 November 2017.
Accepted on: 21 November 2017.
TRANSPORTATION JOURNAL---PENN STATE UNIV PRESS
Submitted on: 22 May 2013.
Revised on: 01 June 2013.
Accepted on: 12 June 2013.
TRANSPORTATION JOURNAL
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Submitted on: 23 June 2000.
Revised on: 09 July 2000.
Accepted on: 25 July 2000.
TRANSPORTATION JOURNAL
Submitted on: 23 August 2003.
Revised on: 06 October 2003.
Accepted on: 31 October 2003.
TRANSPORTATION JOURNAL---PENN STATE UNIV PRESS