Data

PLANiTS: THE METHODS BASE, Model Selection and Model Integration

Picado, Rosella
Khattak, Asad
Lovell, David J.
Kanafani, Adib
1995

This paper presents some features of PLANiTS (Planning and Integration for Intelligent Transportation Systems). In particular, it discusses some functions of the Methods Base. These include representation of model chains, selection of models and data, and data transformations and aggregation. Sequences of models are represented using graph notation. Models and data are selected given the Planning Vector specification, although users may override system selections. The Methods Base features are illustrated with an example drawn from the PLANiTS prototype (version 1 .O).

San Gabriel Valley Smart Shuttle Technology (SGVSST) Field Operational Test Evaluation: Final Report

Giuliano, Genevieve
Moore, II, James E.
O'Brien, Thomas
Golob, Jacqueline
2002

This report presents results of the San Gabriel Valley Smart Shuttle (SGVSS) Field Operational Test (FOT). Results are drawn from a comprehensive evaluation of the FOT conducted over a three-year period. The SGVSS attempted to integrate services of three local municipal public transit operators and a regional fixed route operator via networked computer-assisted dispatching, automated vehicle location, and mobile data terminals. The integrated system was never fully deployed. We describe the project, its participants and the history of the project. The portions of the SGVSS that were...

Development of the Capability-Enhanced PARAMICS Simulation Environment

Chu, Lianyu
Liu, Henry
McNally, Michael
Recker, Will
2005

This report summarizes research work conducted under TO4304 at the University of California, Irvine. Under this task order, the research team provided Caltrans with on-call direct support, technical guidance, and research related support. A series of Paramics plug-ins were developed and have been released to Caltrans. These plug-ins include actuated signal, multiple actuated signal timing plan, actuated signal coordination, detector data aggregator, ramp metering control, on-ramp queue override control, ALINEA ramp metering control, BOTTLENECK ramp metering control, SWARM Ramp metering...

An Information And Institutional Inventory Of California Transit Agencies

Hickman, Mark
Day, Theodore
1996

This research identifies and investigates the current technical and institutional framework for information systems and technologies at public transit agencies in California. The study examines the current state-of- the-art practice for the collection, use and sharing of data for operations monitoring, service planning, performance measurement and customer information. A survey of transit agencies and site visits were conducted. This paper presents these survey results and generates some conclusions for improving agencies.

Development of a Modeling Framework for Analyzing Improvements in Intermodal Connectivity at California Airports

Lu, Xiao-Yun
Gosling, Geoffrey D.
Shladover, Steven E.
Xiong, Jing
Ceder, Avi
2006

This report has been prepared as part of a research project developing a combined quantitative and qualitative approach to planning for improved intermodal connectivity at California airports. The quantitative approach involves the development of an Intermodal Airport Ground Access Planning Tool (IAPT) that combines an air passenger mode choice model, a model of transportation provider behavior and a traffic network analysis model. The qualitative approach will be used to enhance the quantitative analysis to account for those factors which are difficult to quantify and to provide...

Evaluate IST-222 Loop Detector System

Gomes, Gabriel
2009

This report documents work performed under PATH Task Order 5314. The objective of this project has been to assess the potential benefits of a new loop detector card manufactured by Inductive Signal Technologies: the IST-222. The attractive features of this card include a) automatic detection of interference from nearby detectors, b) automatic sensitivity selection, c) high sample rates, d) real time noise attenuation, e) vehicle classification, and f) a USB port on the front panel. The evaluation was carried out in three phases: 1) a simple replacement of existing cards with new IST-222...

Red-Light-Running Collision Avoidance: Final Report

Grembek, Offer
Zhou, Kun
Li, Irene
Li, Meng
Zhang, Wei-Bin
Zou, Zhijun
2009

Red-Light-Running (RLR) is the leading cause of urban crashes. This report presents the findings from an investigation of signal control-related countermeasures to reduce the occurrences of RLR and related collisions. The objectives of this study were to identify and evaluate potential modifications to signal timing schemes in reducing the frequency of RLR and to develop online adaptive RLR collision avoidance algorithms to reduce the possibility of RLR collisions. High quality, second-by-second vehicle count and signal timing and phasing data were collected at arterial intersections. A...

Exploration Of Driver Route Choice With Advanced Traveler Information Using Neural Network Concepts

Yang, Hai
Kitamura, Ryuichi
Jovanis, Paul P.
Vaughn, Kenneth M.
Abdel-aty, Mohammed A.
Reddy, Prasuna Dvg
1993

A model of drivers' route choice behavior under advanced traveler information systems (ATIS) is developed based on data collected from learning experiments using interactive computer simulation. A neural network model is used as a convenient modeling technique in the analysis. Results indicated that most subjects made route choices based mainly on their recent experiences. Results also demonstrated that route choice behavior is related to the personal characteristics as well as the characteristics of the respective routes. Travel experiences had less effect on route choice and the results...

High Collision Concentration Location: Table C Evaluation and Recommendations

Ragland, David R.
Chan, Ching-Yao
2007

This report describes the research work that was conducted under PATH Task Order 5215 and its extension Task Order 6215, “Methods for Identifying High-Concentration Collision Locations (HCCL).” The subject matter is related to regularly published Caltrans reports, so-called Table C, that are used to screen for and investigate locations within the California State Highway System that have collision frequencies significantly greater than the base or expected numbers when compared to other locations. The accuracy and reliability of such reports are critical as Table C is the basis for follow-...

Drag Forces Experienced By Two, Full-scale Vehicles At Close Spacing

Hong, Patrick
Marcu, Bogdan
Browand, Fred
Tucker, Aaron
1998

The present study aims to document the drag reduction for a two-vehicle platoon by operating two full-scale Ford Windstar vans in tandem on a desert lakebed. Drag forces are measured with the aid of a special tow bar force measuring system designed and manufactured at USC. The testing procedure consists of a smooth acceleration, followed by a smooth deceleration of the platoon. Data collected during acceleration allows the calculation of the drag force on the trail-vehicle, while data collected during deceleration is used to calculate the drag on the lead vehicle. Results from the full-...