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Submitted on: 10 October 2015.
Revised on: 21 November 2015.
Accepted on: 26 November 2015.
PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-TRANSPORT
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Submitted on: 03 January 2006.
Revised on: 17 January 2006.
Accepted on: 12 February 2006.
PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-TRANSPORT