A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
An approach to the evaluation of changes in travel unreliability: A “Safety margin” hypothesis
Abstract Even where unreliability has been recognised as a significant component in the generalised cost of trip-making, few attempts have been made to quantify it in the evaluation of transport improvements. This neglect is perhaps explained by the difficulty of observing a suitable “trade-off” situation in which transport users can trade money directly or indirectly for improved reliability of their transport modes. This article investigates the characteristics of a possible trade-off which might be made by commuters — the allowance of extra time for travelling in order to avoid unpredictable lateness at destination. The form of the costs of a response to unreliability of this nature is considered within a more general framework of the allocation of time under uncertainty or risk conditions. Certain other approaches to the evaluation of travel unreliability are reviewed and a brief outline is given to a current research project which attempts to test the applicability of the “safety margin” in London commuters' timing of the trips that they take to work.
An approach to the evaluation of changes in travel unreliability: A “Safety margin” hypothesis
Abstract Even where unreliability has been recognised as a significant component in the generalised cost of trip-making, few attempts have been made to quantify it in the evaluation of transport improvements. This neglect is perhaps explained by the difficulty of observing a suitable “trade-off” situation in which transport users can trade money directly or indirectly for improved reliability of their transport modes. This article investigates the characteristics of a possible trade-off which might be made by commuters — the allowance of extra time for travelling in order to avoid unpredictable lateness at destination. The form of the costs of a response to unreliability of this nature is considered within a more general framework of the allocation of time under uncertainty or risk conditions. Certain other approaches to the evaluation of travel unreliability are reviewed and a brief outline is given to a current research project which attempts to test the applicability of the “safety margin” in London commuters' timing of the trips that they take to work.
An approach to the evaluation of changes in travel unreliability: A “Safety margin” hypothesis
Knight, Trevor E. (author)
Transportation ; 3
1974
Article (Journal)
English
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