The influence of travel time variability on the value of time

Current benefits from travel time savings have only been related to the benefits from reducing mean travel time. Some previous attempts of including variability in the generalised cost function have mainly assumed commuters with fixed arrival time. This paper presents a comprehensive framework for valuing travel time variability that allows for any journey purpose and arrival time constraint. The proposed model is based on the expected utility approach and the mean-standard deviation approach. Stated Preference methods are considered the best technique for providing the data for calibrating the models. The values of time derived from the models are highly influenced by the value of travel time variability and it strongly depends on the probability distribution function travellers are faced with.

[1]  L. J. Savage,et al.  The Utility Analysis of Choices Involving Risk , 1948, Journal of Political Economy.

[2]  Hugh F. Gunn,et al.  Statistical aspects of travel demand modelling , 1982 .

[3]  J. Polak,et al.  A MORE GENERAL MODEL OF INDIVIDUAL DEPARTURE TIME CHOICE --TRANSPORTATION PLANNING METHODS. PROCEEDINGS OF SEMINAR C HELD AT THE PTRC SUMMER ANNUAL MEETING, BATH UNIVERSITY ENGLAND, 7-11 SEPTEMBER 1987, VOLUME P290 , 1987 .

[4]  Marcel K. Richter,et al.  Cardinal Utility, Portfolio Selection and Taxation , 1960 .

[5]  H. Sinn.  Economic Decisions Under Uncertainty , 1983 .

[6]  G. L. S. Shackle,et al.  Uncertainty in Economics and Other Reflections , 1957 .

[7]  K. Borch,et al.  A Note on Uncertainty and Indifference Curves , 1969 .

[8]  J. Neumann,et al.  Theory of games and economic behavior , 1945, 100 Years of Math Milestones.

[9]  Moshe Ben-Akiva,et al.  Discrete Choice Analysis: Theory and Application to Travel Demand , 1985 .

[10]  Hani S. Mahmassani,et al.  Travel time prediction and departure time adjustment behavior dynamics in a congested traffic system , 1988 .

[11]  Mark Wardman,et al.  Stated preference methods and travel demand forecasting: An examination of the scale factor problem , 1991 .

[12]  Karl Borch,et al.  Communications to the Editor—A Note on Utility and Attitudes to Risk , 1963 .

[13]  J J Bates,et al.  A SURVEY OF PEAK SPREADING IN LONDON: METHODOLOGY AND INITIAL RESULTS , 1989 .

[14]  T May,et al.  TRAVEL TIME VARIABILITY AND ITS EFFECT ON TIME OF DAY CHOICE FOR THE JOURNEY TO WORK --TRANSPORTATION PLANNING METHODS. PROCEEDINGS OF SEMINAR C HELD AT THE PTRC SUMMER ANNUAL MEETING, BATH UNIVERSITY ENGLAND, 7-11 SEPTEMBER 1987, VOLUME P290 , 1987 .

[15]  Michael Carter,et al.  Expectations in Economics , 1984 .

[16]  Nils Bruzelius,et al.  The Value of Travel Time. , 1980 .

[17]  A. Roy.  Safety first and the holding of assetts , 1952 .

[18]  David A. Hensher,et al.  VALUATION OF TRAVEL TIME SAVINGS. A DIRECT EXPERIMENTAL APPROACH , 1985 .

[19]  M Wardman,et al.  THE DESIGN OF STATED PREFERENCE TRAVEL CHOICE EXPERIMENTS. WITH SPECIAL REFERENCE TO INTERPERSONAL TASTE VARIATIONS , 1988 .

[20]  Trevor Knight.  An approach to the evaluation of changes in travel unreliability: A “Safety margin” hypothesis , 1974 .

[21]  D. Bernoulli.  Exposition of a New Theory on the Measurement of Risk , 1954 .

[22]  A S Fowkes.  RECENT DEVELOPMENTS IN STATED PREFERENCE TECHNIQUES IN TRANSPORT RESEARCH , 1991 .

[23]  Karl Borch,et al.  Risk aversion and portfolio choice , 1969 .

[24]  G. Shackle,et al.  Uncertainty in Economics and Other Reflections , 1956 .

[25]  Lad Senna.  RISK OF DELAYS, UNCERTAINTY AND TRAVELLERS' VALUATION OF TRAVEL TIME VARIABILITY , 1991 .

[26]  J. Jucker,et al.  An Empirical Study of Travel Time Variability and Travel Choice Behavior , 1982 .

[27]  R. Sheldon,et al.  STATED PREFERENCE METHODS. AN INTRODUCTION , 1988 .

[28]  Donald P. Gaver,et al.  Headstart Strategies for Combating Congestion , 1968 .

[29]  J. Guttman,et al.  UNCERTAINTY CONTINUOUS MODAL SPLIT, AND THE VALUE OF TRAVEL TIME IN ISRAEL , 1986 .

[30]  J. Guttman,et al.  UNCERTAINTY, THE VALUE OF TIME, AND TRANSPORT POLICY , 1979 .

[31]  I G Black,et al.  Quantifying the value of uncertainty in travel time , 1991 .

[32]  S. French.  Decision Theory: An Introduction to the Mathematics of Rationality , 1986 .