Author: Sriram Krishnamurthy
Publisher:
ISBN:
Category :
Languages : en
Pages : 366
Book Description
Uncertainty analysis of an integrated transportaion-land use model and application of Roy's Identity for travel demand modeling
Author: Sriram Krishnamurthy
Publisher:
ISBN:
Category :
Languages : en
Pages : 366
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 366
Book Description
Uncertainty in Integrated Land Use-transport Models
Author: Anant Pradhan
Publisher:
ISBN:
Category : Choice of transportation
Languages : en
Pages : 42
Book Description
This report examines the impact of uncertainty in the land use component of a partially integrated land use-transportation modeling system called UrbanSim. Outputs from the land use model (LUM) act as inputs for a traditional 4-step travel demand model (TDM), and travel times from the traffic-assignment stage of the TDM are fed forward into the subsequent year's LUM. This work examines the propagation of uncertainty across model stages as well as at each model stage over time. A factorized design approach is used to model uncertainty in demographic inputs to the LUM, as well as uncertainty in various model parameters. Results suggest that while several model inputs may affect model outputs in the short run, only those inputs having a cumulative effect are likely to have a significant impact on outputs in the long run. Results also suggest that uncertainty in model outputs may increase for the first few years for which the model is run, as modified inputs send shocks through the urban system. However, the uncertainty level seems to come down in later years, as jobs, households, and developers respond to changed input conditions.
Publisher:
ISBN:
Category : Choice of transportation
Languages : en
Pages : 42
Book Description
This report examines the impact of uncertainty in the land use component of a partially integrated land use-transportation modeling system called UrbanSim. Outputs from the land use model (LUM) act as inputs for a traditional 4-step travel demand model (TDM), and travel times from the traffic-assignment stage of the TDM are fed forward into the subsequent year's LUM. This work examines the propagation of uncertainty across model stages as well as at each model stage over time. A factorized design approach is used to model uncertainty in demographic inputs to the LUM, as well as uncertainty in various model parameters. Results suggest that while several model inputs may affect model outputs in the short run, only those inputs having a cumulative effect are likely to have a significant impact on outputs in the long run. Results also suggest that uncertainty in model outputs may increase for the first few years for which the model is run, as modified inputs send shocks through the urban system. However, the uncertainty level seems to come down in later years, as jobs, households, and developers respond to changed input conditions.
Integrated Transportation and Land Use Forecasting
Author: Stephen H. Putman
Publisher:
ISBN:
Category : Land use
Languages : en
Pages : 128
Book Description
Publisher:
ISBN:
Category : Land use
Languages : en
Pages : 128
Book Description
Beyond Uncertainty
Author: Caroline Rodier
Publisher:
ISBN:
Category : Air quality management
Languages : en
Pages : 74
Book Description
Concerned citizens across the United States are increasingly asking officials about the effects of proposed new highways and their alternatives, such as transit and road pricing, on how their communities will grow, the air their children will breathe, and the amount of time they will have to spend in traffic commuting to work. It is widely acknowledged, however, that the models used to assess these effects have limited accuracy and sensitivity to alternatives to highway expansion. This study attempts to move beyond the issues of uncertainty in models used to forecast the travel, land use, and air quality effects of transportation projects and policies by (1) reviewing the literature on error and uncertainty in travel and land use models to understand key sources, likely confidence bounds, and potential biases; (2) conducting interviews with modeling experts to gain insight into how uncertain models may be improved and better applied in transportation studies; and (3) presenting a series of cases studies that illustrate innovative and, possibly, more credible approaches to modeling given different study objectives, model capability, and knowledge of model uncertainty.
Publisher:
ISBN:
Category : Air quality management
Languages : en
Pages : 74
Book Description
Concerned citizens across the United States are increasingly asking officials about the effects of proposed new highways and their alternatives, such as transit and road pricing, on how their communities will grow, the air their children will breathe, and the amount of time they will have to spend in traffic commuting to work. It is widely acknowledged, however, that the models used to assess these effects have limited accuracy and sensitivity to alternatives to highway expansion. This study attempts to move beyond the issues of uncertainty in models used to forecast the travel, land use, and air quality effects of transportation projects and policies by (1) reviewing the literature on error and uncertainty in travel and land use models to understand key sources, likely confidence bounds, and potential biases; (2) conducting interviews with modeling experts to gain insight into how uncertain models may be improved and better applied in transportation studies; and (3) presenting a series of cases studies that illustrate innovative and, possibly, more credible approaches to modeling given different study objectives, model capability, and knowledge of model uncertainty.
Integrated Urban Models for Simulation of Transit and Land Use Policies
Author: Eric J. Miller
Publisher: Transportation Research Board
ISBN: 9780309063241
Category : Business & Economics
Languages : en
Pages : 44
Book Description
Describe how transit agencies, metropolitan planning organizations, and state DOTs can act today to initiate or expand their analytical tools for integrated land use-transportation planning. The Guidelines are intended for the general reader having an interest in the effects of transit on land use. The Guidelines describe currently available integrated models, the characteristics of an "ideal" integrated model, and steps that a planning organization should take in order to support and expand such modeling capability.
Publisher: Transportation Research Board
ISBN: 9780309063241
Category : Business & Economics
Languages : en
Pages : 44
Book Description
Describe how transit agencies, metropolitan planning organizations, and state DOTs can act today to initiate or expand their analytical tools for integrated land use-transportation planning. The Guidelines are intended for the general reader having an interest in the effects of transit on land use. The Guidelines describe currently available integrated models, the characteristics of an "ideal" integrated model, and steps that a planning organization should take in order to support and expand such modeling capability.
Input, Parameter, and Spatial Uncertainty in a Fully Integrated Land Use and Transportation Model
Assessment of Integrated Transportation/land Use Models
Author: Robert A. Johnston
Publisher:
ISBN:
Category : Land use
Languages : en
Pages : 118
Book Description
Publisher:
ISBN:
Category : Land use
Languages : en
Pages : 118
Book Description
The Integrated Forecasting of Transportation and Land Use
Author: Stephen H. Putman
Publisher:
ISBN:
Category : Housing
Languages : en
Pages : 36
Book Description
Publisher:
ISBN:
Category : Housing
Languages : en
Pages : 36
Book Description
Urban Travel Demand Modeling
Author: Norbert Oppenheim
Publisher: Wiley-Interscience
ISBN:
Category : Political Science
Languages : en
Pages : 512
Book Description
In addition, models for optimal transportation supply decisions are integrated with the demand models. Transit travel and goods movements are specifically addressed.
Publisher: Wiley-Interscience
ISBN:
Category : Political Science
Languages : en
Pages : 512
Book Description
In addition, models for optimal transportation supply decisions are integrated with the demand models. Transit travel and goods movements are specifically addressed.
Innovations in Travel Demand Modeling
Author:
Publisher:
ISBN: 9781680157574
Category : Choice of transportation
Languages : en
Pages :
Book Description
On May 21 through 23, 2006, the Transportation Research Board (TRB) convened the Innovations in Travel Demand Modeling Conference in Austin, Texas. The conference was sponsored by the following agencies, organizations, and companies to provide an opportunity for a frank exchange of ideas and experiences among academics, model developers, and practitioners: TRB, FHWA, FTA, the Central Texas Regional Mobility Authority, the Capital Metropolitan Transportation Authority, PBS & J-Austin, URS Corporation, and HNTB Corporation. Approximately 220 individuals from across the transportation research community at national, state, regional, and local levels and from the public and private sectors and academia participated. The last major conference on specialty travel demand modeling was held as part of the U.S. Department of Transportation's Travel Model Improvement Program (TMIP) in the fall of 1996. At that time, there was little research and no practical application of land use models and activity-based travel demand models and their integration with demographic, economic, and network modes. Since then, there has been a literal revolution in travel demand forecasting.
Publisher:
ISBN: 9781680157574
Category : Choice of transportation
Languages : en
Pages :
Book Description
On May 21 through 23, 2006, the Transportation Research Board (TRB) convened the Innovations in Travel Demand Modeling Conference in Austin, Texas. The conference was sponsored by the following agencies, organizations, and companies to provide an opportunity for a frank exchange of ideas and experiences among academics, model developers, and practitioners: TRB, FHWA, FTA, the Central Texas Regional Mobility Authority, the Capital Metropolitan Transportation Authority, PBS & J-Austin, URS Corporation, and HNTB Corporation. Approximately 220 individuals from across the transportation research community at national, state, regional, and local levels and from the public and private sectors and academia participated. The last major conference on specialty travel demand modeling was held as part of the U.S. Department of Transportation's Travel Model Improvement Program (TMIP) in the fall of 1996. At that time, there was little research and no practical application of land use models and activity-based travel demand models and their integration with demographic, economic, and network modes. Since then, there has been a literal revolution in travel demand forecasting.