Abstract:The UMOT, or Unified Mechanism of Travel, is proposed as an alternative to traditional approaches for modeling interactions between and urban structure. The aim of the approach is to assist policy mak...The UMOT, or Unified Mechanism of Travel, is proposed as an alternative to traditional approaches for modeling interactions between and urban structure. The aim of the approach is to assist policy makers in dealing with such issues as the short and long term effects of energy prices and Avalability; predicting changes in urban structure; forecasting car ownership levels; and the optimal long-term allocation of resources to the various modes. The UMOT approach focusses on regularities in household daily time and money expenditures, which are observed to be transferable both spatially and temporally. The use of total expenditures and unit costs eliminates the need in conventional models to calibrate coefficients correlating trip components to separate lists of explanatory variables. The UMOT approach generates simultaneous estimates of components, such as daily distance, modal shares, car ownership levels and household locational patterns, which are compared with observed data-not calibrated to them-for model validation. Results of the analyses presented in this report, at both aggregate and disaggregate levels, corroborate previous results. A new development of this study is the formulation, testing and verification of travel probability fields. These fields describe the spatial distribution of single trips in continuous probabilistic terms. Travel probability fields, as measure of accessibility, are found to be consistent with urban economic models of location decisions. This allows patterns to be related theoretically to urban structure through a dynamic feedback process.Read More
Publication Year: 1981
Publication Date: 1981-01-01
Language: en
Type: article
Access and Citation
Cited By Count: 58
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