Intelligent Transportation Systems

Sketch Of An Ivhs Systems Architecture

Varaiya, P. P.
Shladover, Steven E.
1991

Presents a sketch of a system architecture for the control and management tasks of an intelligent vehicle/highway system (IVHS)

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).

Theoretical And Empirical Analysis Of Path Magnetic Lane Tracking For The Intelligent Vehicle Highway System

Andrews, Angus
Rockwell International Science Center
1992

This report characterizes the statistical performance of the magnetic nails concept for estimating the positions of vehicles within their marked lanes. The report also presents a mathematical model for sensor noise due to the distortions of the earth field by regular patterns of ferrous reinforcing bars in the pavement.

Intelligent Sensor Validation And Sensor Fusion For Reliability And Safety Enhancement In Vehicle Control

Agogino, Alice
Goebel, Kai
Alag, Sanam
1995

This research project is concerned with sensor validation and sensor fusion as part of a five module hierarchical architecture for supervisory control. The goal is to enhance reliability and safety of the Intelligent Vehicle Highway System (IVHS) by taking into consideration the uncertainty of sensors and the system. Potential hazards are detected and feasible maneuvers are recommended within the upper modules of the architecture.

Vehicle Lateral Control under Fault in Front and/or Rear Sensors

Huang, Jihua
Lu, Guang
Tomizuka, Masayoshi
2000

The objectives of the project are: (1) to study the behavior of existing vehicle lateral control systems in the event of magnetometer failures, (2) to design controllers that use the output from only one set of magnetometers, and (3) to develop an autonomous lateral control scheme that uses no magnetometers. The performance of existing lateral control systems subject to magnetometer fail- ures is evaluated based on both linearized and complex nonlinear vehicle models. Simulation results indicate that rear magnetometer failures result in degraded oper- ation, and that front magnetometer...

Vehicle Lateral Control Under Fault in Front and/or Rear Sensors

Lu, Guang
Huang, Jihua
Tomizuka, Masayoshi
2003

This report documents the findings of research performed under TO4204, "Vehicle Lateral Control under Fault in Front and/or Rear Sensors" during the year 2000- 2001. The research goal of TO4204 is to develop vehicle lateral control strategies under faulty operation of the magnetometers. The main objectives of the project are: (1) to design controllers that use the output from only one set of magnetometers, and (2) to develop an autonomous lateral control scheme that uses no magnetometers. New controllers that use just the front magnetometers have been designed based on H1 optimal design...

Toward Deployment of Adaptive Transit Signal Priority Systems

Li, Meng
Zhou, Kun
Yin, Yafeng
Tan, Chin-Woo
Zhang, Wei-Bin
Sun, Sonja
Leung, Kai
Lau, James
2008

This document reports the continuous efforts conducted by California PATH Program on the development and implementation of an Adaptive Transit Signal Priority (ATSP) system. The ATSP system has three distinguished features, including: (1) providing priority to transit vehicles while making a tradeoff between bus delay savings and the impacts on the rest of the traffic, (2) utilizing existing AVL/communication system already instrumented on buses to continuously monitor bus locations and predict bus arrival times to intersections and to request signal priority, and (3) building upon closed-...

Development and Testing of Field-Deployable Real-Time Laser-Based Non-Intrusive Detection System for Measurement of True Travel Time on the Highway

Cheng, Harry H.
Shaw, Ben
Palen, Joe
Hu, Xudong
Lin, Bin
Larson, Jonathan E.
Van Katwyk, Kirk
2001

We have developed a field prototype of a laser-based non-intrusive detection system for real-time measurement of delineations of moving vehicles for highway testing, based on our previous research on the laboratory prototype of the system. The primary goal of this project is to develop a roadway detection system that can be used to gather reliable travel time data non-intrusively. The system uses a laser line that is projected onto the ground as a probe. The reflected light is collected and focused into a photodiode array by an optical system. Vehicle presence is detected based on the...

CARTESIUS and CTNET - Integration and Field Operational Test

McNally, Michael G.
Rindt, Craig R.
2010

This report describes the conclusion of PATH Task Order 6324: CARTESIUS and CTNET---Field Operational Test. We describe the results of the multi-year project focused on integrating Caltrans primary signal management system, CTNET, with a major product from the Caltrans ATMS Testbed: the Coordinated Adaptive Real-Time Expert System for Incident management in Urban Systems, or more simply, CARTESIUS. The major products of this research include numerous software products for integrating CTNET with field devices, simulation software, with other traffic management systems in general, and with a...

EasyConnect II: Integrating Transportation, Information, and Energy Technologies at the Pleasant Hill BART Transit Oriented Development

Rodier, Caroline
Shaheen, Susan A.
Blake, Tagan
Lidicker, Jeffrey R.
Martin, Elliot
2010

Smart growth policy strategies attempt to control increasing auto travel, congestion, and vehicle emissions by redirecting new development into communities with a high-intensity mix of shopping, jobs, and housing that is served by high-quality modal alternatives to single occupant vehicles. The integration of innovative technologies with traditional modal options in transit-oriented developments (TODs) may be the key to providing the kind of high-quality transit service that can effectively compete with the automobile in suburban transit corridors. A major challenge, however, of such an...