Modeling

The Netcell Simulation Package: Technical Description

Cayford, Randall
Lin, Wei-Hua
Daganzo, Carlos F.
1997

This report describes the NETCELL simulation package. NETCELL is a freeway network simulation program based on the cell transmission model which captures the dynamic evolution of multicommodity traffic over a freeway network with three-legged junctions in a way that is consistent with the hydrodynamic theory of highway traffic. NETVIEW is a graphical postprocessor for viewing NETCELL output files. This document discusses implementation of the programs in detail, including the cell representation for a freeway network with three-legged junctions, data and file structures, inputs and outputs...

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...

Smart Parking Management Field Test: A Bay Area Rapid Transit (BART) District Parking Demonstration; Final Report

Rodier, Caroline J., PhD
Shaheen, Susan A., PhD
Kemmerer, Charlene
2008

This report presents an evaluation of the first transit-based smart parking project in the U.S. at the San Francisco Bay Area Rapid Transit (BART) District station in Oakland, California. The report begins with a review of the smart parking literature; next the smart parking field test is described including its capital, operational, and maintenance costs; then the results of the participant survey analysis are presented; and finally lessons learned from the institutional, user, and operational perspective are documented. Some key changes in participant travel behavior include increases in...

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...

Lateral Control Of Heavy Duty Vehicles For Automated Highway Systems

Tai, M.
Wang, J.-y.
Hingwe, P.
Chen, C.
Tomizuka, M.
1998

This report presents a linear analysis of a tractor semitrailer model. The analysis is followed by the design of a simple linear controller for lane following. Offtracking analysis is presented for a single unit vehicle and tractor semitrailer. This analysis is independent of the control design. Modeling of multi-unit articulated vehicles is also presented. Both a complex simulation model and a simplified control design model are derived for a general road train.

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.

Turning Movement Estimation In Real Time (TMERT)

Martin, Peter T.
1995

This report describes the development of a new model that can monitor system performance and derive management and control strategies in real time. It presents the TMERT (Turning Movement Estimation in Real Time) model, a method of estimating turning movement flows from link detected flows at small recurrent intervals, in real time.

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...