PATH

A Vehicle to Roadside Communications Architecture for ITS Applications

Lo, Tetiana
Varaiya, Pravin
2000

In this report we present a framework to assist Intelligent Transportation Systems (ITS) providers in the deployment of ITS user services requiring wide-area wireless communi-cations. We examine a scenario in the San Francisco East Bay Area for the 1995 time frame and determine the applicable ITS user services and wide-area wireless messaging requirements. Using the programming language SHIFT we investigate the uplink perfor-mance of a leading wireless candidate, Cellular Digital Packet Data in terms of its ability to support vehicle-to-roadside ITS applications during normal peak-period...

Longitudinal Control- Phase 1

Chang, Kwang Soo
1995

The objective of the project is to assess the feasibility of vehicle-follower control withhigh accuracy and good ride quality, using a Doppler radar as the primary sensor (SeeAppendix A.1 - A.3).

Organizing For ITS: Computer Integration Transportation Phase 1: Results For Arterial And Highway Transportation Management Centers

Hall, Randolph W.
Lo, Hong K.
Minge, Erik
1994

The objective of this study is to evaluate alternative frameworks for Computer Integrated Transportation (CIT) from an institutional perspective. This was accomplished through site visits and interviews at existing Transportation Management Centers (TMCs), along with focus group sessions in which strategies for CIT were presented to TMC managers and staff for their comments and discussion. The study found that four factors: 1) time-frame, 2) linking information to actions, 3) broadcast orientation, and 4) embracement of new technologies have profound implications for Intelligent...

The Role Of Advanced Traveller Information Systems In Incident Management

Al-deek, Haitham Mohammed
1992

This dissertation deals with the application of Advanced Traveler Information Systems (ATIS) in incident management. Using an idealized traffic corridor and deterministic queuing methods, conditions under which route guidance information is useful are identified. Benefits to traffic guided with ATIS are estimated and system performance is evaluated in diverse environments of non-recurring congestion.

Augmented Speed Enforcement Project at UC Berkeley

Chan, Ching-Yao
Gupta, Somak Datta
Huang, Jihua
Chiu, Guan-Ling
Nelson, David
Lian, Thang
2013

This report describes the development of an automated speed enforcement (aSE) system. The main function of the aSE system is to communicate relevant speed, violation, and hazard information to the stakeholders in the work zone context: drivers, CHP officers, and workers. The system consists of two sub-systems that can work jointly in an integrated manner as a whole but they can also be deployed and tested separately.

Bus Rapid Transit (BRT) Toolbox: Assessing Person Throughput to Measure Transportation Impacts for BRT Projects

Koling, Adam
Zhang, Wei-Bin
Zhou, Kun
Meng, Huadong
2018

This report studied person throughput as an impact metric for proposed BRT routes under Caltrans jurisdiction, given the agency’s specific interest in preserving or improving the performance of particular state-owned corridors. It also introduces a simple spreadsheet tool to estimate a BRT project’s traffic impact and show how improved bus service can boost corridor performance. Representatives of Caltrans D4, D7, and D11 were interviewed after tentative development of the tool, expressed support of a transition towards person throughput, and offered feedback on how the tool might best...

Advanced Information Techniques And Paratransit Services To Enhance Mobility Of Elderly And Disabled Travelers

Chen, Wan-Hui
Klaver, Kelley
Uwaine, Rochelle
Jovanis, Paul P.
1998

This study focused on determining whether advanced transportation services and information systems could enhance the mobility of disabled and elderly travelers in their use of transit, paratransit, or advanced paratransit services. The advanced proposed systems included regular paratransit and two advanced paratransit systems (real-time paratransit and real-time ridesharing) and five transportation information systems: computer, television, operator-assisted telephone, automated telephone, and personal information systems.

A Verified Hybrid Controller For Automated Vehicles

Lygeros, J.
Godbole, D. N.
Sastry, S.
1997

In this report the authors present a unified framework for carrying out safety calculations for the automated highway problem and obtain sufficient conditions for a set of continuous controllers to be safe and use these conditions to design a discrete scheme that switches between them. Guarantees of safety for the closed loop hybrid system follow by design/

VII California: Development and Deployment Proof of Concept and Group-Enabled Mobility and Safety (GEMS)

Misener, Jim
Sengupta, Raja
Ahern, Katherine
Gupta, Somak Datta
Dickey, Susan
Kuhn, Tom
Lian, Thang
Manasseh, Christian
Nelson, David
Rezai, Shahram
Sharafsaleh, Ashkan
Shladover, Steven
VanderWerf, Joel
2010

This PATH Research Report covers the (Vehicle-Infrastructure Integration) VII California Development and Deployment (Task Order6217) efforts beginning in 2008 and concluding June 30, 2009. This is a successor to the report for TO 5217and reports theapplications-oriented research subsequent to that work.The report is organized by a synopsis of the background and reasons for the VII California project, then it summarizes some of the antecedent (TO 5217) work: the "Innovative Mobility Showcase" (2005), which established the architecture and, importantly the applications (curve overspeed...

Brake System Modeling, Control And Integrated Brake/throttle Switching Phase I

Hedrick, Karl
Gerdes, J.C.
Maciuca, D.B.
Swaroop, D.
1997

This report is concerned with the modeling and control issues regarding braking in an Intelligent Transportation Systems (ITS) setting. Specifically, it addresses the issue of vehicle control in an automated highway system, brake actuation and coordinated brake and throttle switching. It first presents a hydraulic model of the brake system. A method for designing stable controllers for uncertain, mismatched nonlinear system is then described. A method to estimate the coefficient between the brake pressure at the wheel and the brake torque is presented. The next section describes a...