Modeling

Assessing Opportunities for Intelligent Transportation Systems in California's Passenger Intermodal Operations and Services

Miller, Mark A.
Loukakos, Dimitri
2001

This report presents the findings of its investigation into intermodal passenger transfer facilities' operations and services in urban areas of California and the opportunities for how the application of intelligent transportation systems may enhance such operations and services. The project was based initially on a macroscopic assessment of intermodal passenger transfer facility operations and services primarily by means of a review of the literature followed by a three-tier analysis through site visits, institutional aspects, and user views and opinions. Institutional aspects were...

The Built Environment and Health: Impacts of Pedestrian-Friendly Designs on Air Pollution Exposure

Nazelle, A De
Rodriguez, DA
Crawford-Brown, D
2009

In the wake of the growing popularity of pedestrian-oriented community designs, it is timely to assess potential risk trade-offs of such urban planning strategies. Pedestrian-friendly designs are currently being called for and implemented in the US to tackle in particular problems associated with insufficient physical activity in the population. Unintended consequences may emerge, however, especially due to potential increases in the inhalation of pollutants as the population walking or cycling in polluted environments increases. A risk assessment of such built environment...

Capitalization of BRT Network Expansions Effects into Prices of Non-Expansion Areas

Rodriguez, DA
Mojica, CH
2009

A before and after hedonic model is used to determine the property value impacts on properties already served by the transit system caused by extensions to Bogotá’s bus rapid transit system. Asking prices of residential properties belonging to an intervention area (N=1407 before, 1570 after) or a control area (N=267 before, 732 after) and offered for sale between 2001 and 2006 are used to determine capitalization of the enhanced regional access provided by the extension. Properties offered during the year the...

A Spatial Agent-Based Model for the Simulation of Adults' Daily Walking Within a City

Yang, Y
Roux, AV Diez
Auchincloss, AH
Rodriguez, DA
Brown, DG
2011

Environmental effects on walking behavior have received attention in recent years because of the potential for policy interventions to increase ...

Large-Scale Traffi c Simulation Through Distributed Computing of Paramics

Liu, Henry X.
Ma, Wenteng
Jayakrishnan, R.
Recker, Will
2004

Simulation modeling is an increasingly popular and effective tool for analyzing transportation problems, which are not amendable to study by other means. We examine the need for parallel or distributed simulation approaches from the need for computational speed-ups, availability of options towards that, and then at the need to distribute the effort to develop network simulation contexts and datasets. After an overview of the general techniques for the distributed discrete-event simulation and previous efforts on the distributed traffic simulation, we present the general architecture of the...

University of California, Davis Long-Range Development Plan: A Davis Smart Mobility Model

Shaheen, Susan
Rodier, Caroline J.
Finson, Rachel S.
2003

The goal of the Smart Mobility Model project was to optimize individual mobility options through improved connectivity among modes, enhanced techniques to link landuse planning and transportation system design, advanced information technologies, and clean-fuel vehicles. The California PATH/Caltrans partnership with the University of California, Davis (UC Davis) was initiated after campus planners expressed interest in learning how innovative mobility services and technologies (such as carsharing and smart parking management) might help to alleviate the transportation impacts of a campus...

New Approach to Bottleneck Capacity Analysis: Second Interim Report, Work Accomplished During Fiscal Year 2004-2005

Banks, James
2006

This report documents work accomplished during Fiscal Year 2005-2005 as a part of a research project entitled “New Approach to Bottleneck Capacity.” This project is developing an alternative to the traditional Highway Capacity Manual approach to capacity analysis in which capacity flow [either pre-queue flow (PQF) or queue discharge flow (QDF)] is related to a set of intervening variables, including the average time gaps in the critical lane (i. e., that with the highest flow rate) and the distribution of flow across the lanes, represented by the critical lane flow ratio (i. e., the flow...

Qualitative Analysis on the Performance of Non-uniform Platoons: Report I; Non-uniformities and Performance Issues

Tongue, Benson H.
Packard, Andy
Sachi, Paul
1997

This is the first of two reports in which we detail the accomplishments and findings of a two-year research project aimed at determining control and spacing strategies as well as developing performance issues for automated vehicles traveling in platoons under non-uniform conditions. The first phase of the research was geared toward determining parameter uncertainty ranges for a given model and expected disturbances that materially affect the behavior of a vehicle in a platoon. Once this was completed, the relevant criteria for determining platoon performance were investigated. A simulation...

The Naturalistic Driver Model: Development, Integration, and Verification of Lane Change Maneuver, Driver Emergency and Impairment Modules: Final Report

Cody, Delphine
Tan, Swekuang
2009

This report describes the development of a driver model from a Human Science perspective, with the goal of integrating this model into a simulation environment supporting the design and support of Intelligent Transportation Systems. It also provides a discussion regarding the challenges faced in such an enterprise, concluding with a discussion concerning the need to develop a driver simulator.

An Assessment of Loop Detector and RTMS Performance

Coifman, Benjamin
2004

Traffic detectors support most traffic management applications, so it is important that a detector performs as expected. This study evaluates the performance of four loop sensor models and the Remote Traffic Microwave Sensor (RTMS), adding to the body of sensor performance knowledge through the use of new analytical techniques. The study collected contact closure data from all five of the detectors and concurrent video data. Each loop sensor was deployed following Caltrans guidelines for at least 24 hours across dual loop detectors in each lane of I-80, north of Oakland, CA. The research...