PATH

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.
Et. al.
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.

A Fuzzy Rule-Based Controller For Automotive Vehicle Guidance

Hessburg, Thomas
Tomizuka, Masayoshi
1991

A fuzzy rule-based controller is applied to lateral guidance of a vehicle for an automated highway system. The fuzzy rules, based on human drivers' experiences, are developed to track the center of a lane in the presence of external disturbances and over a range of vehicle operating conditions.

Implementing a Kalman Filtering Dynamic O-D Algorithm within Paramics- Analysing Quadstone Won Efforts for the Dynamic O-D Estimation Problem

Garcia, Reinaldo C.
2003

This Project moves forward from the accumulated knowledge garnered from MOU 4121. Over the last year a good deal of insights was obtained about the implementation of dynamic Origin-and-Destination (O-D) estimation. Under MOU 4121, the Kalman Filtering (KF) algorithm described in Hu et al. (2000) for dynamic O-D estimation was implemented. In this research, the implemented algorithm is incorporated to the microscopic traffic simulator Paramics.Paramics offers important and unprecedented features, such as high performance and scalability, to handle realistic real world traffic networks under...

Intelligent Vehicle/highway System Safety: Multiple Collisions In Automated Highway Systems

Hitchcock, Anthony
1995

In this report, a comparison is drawn between the casualty rates per failure on an automated highway system (AHS) according to the longitudinal control configuration used. The comparison is drawn between closed-spaced platooning, vehicle following of the types used in Autonomous Intelligent Cruise Control (AICC) and Cooperative Intelligent Cruise Control, and a point-following configuration (PFC). The model used permits evaluation of the consequences of a failure, allowing for the multiple collisions that usually ensue.

The Market for Traffic Information-Study of Industry Structure and Prospects

Chan, Shirley
Malchow, Matthew
Kanafani, Adib
1999

The market for traffic information has grown considerably in the past 10 years. Traffic information is different from other goods because the cost to users is negligible and the product is indirectly priced. As a result of these unique characteristics, the classic economic model can not be applied to determine the price or the amount of information which would be produced and consumed under competitive equilibrium. Examination of the history of traffic information as a marketable good and the structure of the market indicate that traffic information providers are experiencing significant...

Deployment and Evaluation of Real-Time Vehicle Reidentification from an Operations Perspective

Coifman, Benjamin
Varaiya, Pravin
2002

This Section improves upon the vehicle reidentification algorithm presented in Coifman and Cassidy (in press) for consecutive detector stations on a freeway; in the algorithm, a vehicle measurement made at a downstream detector station is matched with the vehicle's corresponding measurement at an upstream station. The work should be applicable to any detector technology capable of extracting a reproducible vehicle measurement, or vehicle signature. The algorithm is presented using measured vehicle lengths from conventional dual loop detectors; however it could easily be adapted to match...

Longitudinal Control Development For IVHS Fully Automated And Semi - Automated System: Phase III

Hedrick, J. K.
Garg, V.
Gerdes, J. C.
Maciuca, D. B.
Swaroop, D.
1997

This report focuses on longitudinal issues regarding modeling and control of vehicles in an Intelligent Transportation Systems (ITS) setting. Specifically, the report addresses the issue of vehicle control in an automated highway system, brake actuation and brake control. Recent research findings in the area of automated vehicle platooning on isolated lanes of an automated highway are included. Performance specifications, control system architecture, vehicle control algorithms, actuator and sensor specifications and communication requirements are also discussed. The report also addresses...

Evaluation of the Anaheim Advanced Traffic Control System Field Operational Test: Final Report Task B; Assessment of Institutional Issues

McNally, M.G.
Moore, James E., II
MacCarley, C. Arthur
Jayakrishnan, R.
1999

This report provides an overview of the technical and institutional issues associated with the evaluation of the federally-sponsored Anaheim Advanced Traffic Control System Field Operations Test. The primary FOT objective was the implementation and performance evaluation of adaptive traffic signal control technologies including an existing second generation approach, SCOOT, and a 1.5 generation control (1.5GC) approach under development. Also selected for implementation was a video traffic detection system (VTDS). The SCOOT evaluation was defined relative to existing, first generation UTCS...

Highway Electrification And Automation Technologies - Regional Impacts Analysis Project: Phase I: Baseline Scenario Data Analysis

Scag
Path
1993

The Highway Electrification and Automation Technologies Regional Impacts Analysis Project addresses the transportation-related problems of freeway congestion, air pollution, and dependence on fossil fuels in southern California. This report presents a documentation of the basis for the impacts analysis. It contains sections on data collected, baseline forecast for 2025, and electrification and automation specification scenarios. This report constitutes the final report for Phase I of the project.

Parameter Estimation and Command Modification for Longitudinal Control of Heavy Vehicles

Bae, Hong S.
Gerdes, J. Christian
2003

Commercial heavy vehicles, unlike passenger vehicles, display huge variation in parameters such as vehicle mass. Coupled with lower actuation authorities (engine and brake capabilities), these variations can induce actuator saturation even in moderately demanding maneuvers, presenting challenge to the task of maintaining string stability in a platoon formation of heavy trucks. A new control scheme is proposed to put on-line bounds, or artificial saturation, on command signals via parameter estimation such that all members in a platoon can follow the reference commands without saturating...