PATH

Models of Vehicular Collision: Development and Simulation with Emphasis on Safety V: MEDUSA: Theory, Examples, User's Manual, Programmer's Guide and Code

O'Reilly, Oliver M.
Papadopoulos, Panayiotis
Lo, Gwo-Jeng
Varadi, Peter C.
1999

This document constitutes a final report for MOU 39. It contains a User's Manual, Programmer's Guide, source code and underlying theory for the program MEDUSA. This program is capable of simulating both the normative driving dynamics and collision dynamics of an arbitrary number of vehicles. Its range of validity lies in the assumed nature of the vehicular collision, and it is recommended for use in studying low relative velocity impact scenarios at large time-scales. Keywords: IVHS America, Vehicle Dynamics, Collision Dynamics, Safety, computer Simluation, Animal and Simulation; A...

Assessing the Value of TMCs and Methods to Evaluate the Long Term Effects of ITS Implementation: A General Equilibrium Approach

Gillen, David
2004

This research builds on the contributions of MOU 357, 3001 and task Order 4119 all of which focus on methodological and measurement issues in benefit cost assessments of ITS applications. The important contributions of this work are not only providing methods for calculating benefits and costs but also an empirical assessment of the set of projects that have been implemented. In all of this work, as well as most other project evaluation studies, two strong assumptions are made. First, the project is implemented successfully and second the impact of the transportation project is felt wholly...

Models of Vehicular Collision: Development and Simulation with Emphasison Safety II: On the Modeling of Collision between Vehicles in a Platoon System

O'Reilly, Oliver M.
Papadopoulos, Panayiotis
Lo, Gwo-jeng
Varadi, Peter C.
1997

In this report, an algorithm for the detection of collision between two vehicles is presented. The mechanical models used for the vehicles are based on the theory of a Cosscrat point. Here, we find it convenient to establish the corresponding models using the theory of a psuedo-rigid body. This theory facilitates the development of our collision-detection algorithm. The report concludes with four examples of vehicular impact scenarios in order to illustrate the applicability of the proposed algorithm.

Carlink- A Smart Carsharing System Field Test Report

Shaheen, Susan
Wright, John
Dick, David
Novick, Linda
2000

The CarLink field test combined short-term rental vehicles with communication and reservation technologies to facilitate shared-vehicle access. The ten-month demonstration was implemented and researched by two teams at the Institute of Transportation Studies at UC Davis. Project partners included American Honda Motor Company, BART, Caltrans, PATH, and LLNL. INVERS and Teletrac provided advanced carsharing and vehicle tracking technologies.

Fuzzy Throttle And Brake Control For Platoons Of Smart Cars

Kim, H.
Dickerson, J.
Kosko, B.
1995

This study demonstrates the use of an additive fuzzy system to control the velocity and gap of cars in a single lane two-car platoon. A throttle- only controller and a combined throttle and braker controller were tested. Simulation results show that follower cars with a combined brake/ throttle controller can maintain a constant gap when the platoon goes down hills and slows. An adaptive throttle controller uses a neural system to learn the fuzzy rules for different vehicle types.

Integration of GPS/INS and Magnetic Markers for Advanced Vehicle Control

Farrell, Jay
Barth, Matthew
2001

This report describes the results of a project supported by California Partners for Advanced Transit and Highways (PATH). The main objective of the project was to develop and demonstrate a triple redundancy navigation system incorporating magnetometer, inertial, and carrier phase differential Global Positioning System (GPS) measurements.

Cooperative Adaptive Cruise Control (CACC) For Partially Automated Truck Platooning:Final Report

Shladover, Steven
Lu, Xiao-Yun
Yang, Shiyan
Ramezani, Hani
Spring, John
Nowakowski, Christopher
Nelson, David
2018

Cooperative Adaptive Cruise Control (CACC) provides an intermediate step toward a longer-term vision of trucks operating in closely-coupled automated platoons on both long-haul and short-haul freight corridors. There are important distinctions between CACC and automated truck platooning. First, with CACC, only truck speed control will be automated, using V2V communication to supplement forward sensors. The drivers will still be responsible for actively steering the vehicle, lane keeping, and monitoring roadway and traffic conditions. Second, while truck platooning systems have relied on a...

Opportunities And Constraints For Advanced Highway Technologies: A Speculative Analysis

Deakin, Elizabeth
1989

Might the performance of transportation systems be significantly improved through greater application of emerging technologies? Recent advances in computers, materials, communications, control systems, information systems, and many other areas raise intriguing possibilities.

Development and Implementation of a Vehicle-Centered Fault Diagnostic and Management System for the Extended PATH-AHS Architecture: Part II

Yi, Jingang
Suryanarayanan, Shashikanth
Howell, Adam
Horowitz, Roberto
Tomizuka, Masayoshi
Hedrick, Karl
2002

This project is a continuation of MOU 373. It concludes ongoing research to extend and integrateexisting results on fault diagnostic and fault management research, and develop a comprehensivefault management system. Features include a multi-layer fault diagnostic and management system,diagnosis of faults in the sensors and actuators of the lateral and longitudinal control systems, detec-tion of faults in the most vital sensors and actuators, and development of a systematic methodologyfor processing diagnostic residues. Experimental implementation and testing of the completed sys-tem is...

Development of Requirement Specifications for Transit Frontal Collision Warning System

Wang, Xiqin
Lins, Joanne
Chan, Ching-Yao
Johnston, Scott
Zhou, Kun
Steinfeld, Aaron
Hanson, Matt
Zhang, Wei-Bin
2003

The U.S. Department of Transportation (US DOT) initiated the Intelligent Vehicle Initiative (IVI) Program with the goal of improving safety through the application of advanced technologies. The frontal collision warning function has been identified as one of the key safety improvement measures for the transit vehicle platform of the IVI Program. Frontal collision, defined as a bus colliding with a vehicle in front of the bus, is a frequent incident in transit bus operations and the cause of property damage, personal injuries, and interruption to bus operations. A team that includes San...