Submitted on: 24 February 2018.
Revised on: 21 May 2018.
Accepted on: 05 June 2018.
___________________Journal of Transport Geography
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Submitted on: 13 August 2003.
Revised on: 30 November 2003.
Accepted on: 07 January 2004.
___________________Journal of Transport Geography
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Submitted on: 20 February 2017.
Revised on: 18 April 2017.
Accepted on: 04 June 2017.
___________________Journal of Transport Geography
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Submitted on: 21 January 1999.
Revised on: 21 March 1999.
Accepted on: 15 May 1999.
___________________Journal of Transport Geography
Submitted on: 31 December 2002.
Revised on: 28 March 2003.
Accepted on: 19 April 2003.
___________________Journal of Transport Geography