Roads/Highways

Commercial Motor Vehicle Inspection and Screening Stations: Evaluating Performance from the Perspective of Practitioners

Miller, Mark A.
Garefalakis, Antonios
2009

This report presents the findings of a study of commercial motor vehicle inspection and screening station practices with a focus on the use of various technologies to help address problems related to safety, security, roadway infrastructure, and air quality. A review of industry literature identified the various types of inspection and screening practices that have been and are being implemented including weight and size management, on-board equipment checking, driver-related violations and cargo monitoring, credential checking, and exhaust emissions monitoring. The review also identified...

California Intersection Decision Support: A Driver-Centered Approach to Left-Turn Collision Avoidance System Design

Bougler, Bénédicte
Cody, Delphine
Nowakowski, Christopher
2008

Currently, Federal and State governments are partnering with private industries and academia institutions to pursue the deployment of intersection decision support (IDS) and cooperative intersection collision avoidance systems (CICAS), which seek to combine infrastructure-based and vehicle-based functions to provide optimal solutions for roadway users. The overall (IDS) research plan was constructed to explore the requirements, tradeoffs assessment, and technology investigations necessary to define a Cooperative Intersection Collision Avoidance System. This report is the third report on...

Evaluation And Analysis Of Automated Highway System Concepts And Architectures

Ioannou, Petros
1998

This is the final report for the project entitled \Evaluation and Analysis of Automated Highway System Concepts and Architectures" in response to the contractual requirements of the Memorandum of Understanding MOU# 235, between the Partners of Advanced Transit and Highways (PATH) and the University of Southern California, administered at the University of Califor- nia at Berkeley. The purpose of this project was to select, evaluate and analyze a num- ber of promising Automated Highway System (AHS) operational concepts based on previous work. The evaluation and analysis includes headway dis...

Using Cooperative Adaptive Cruise Control (CACC) to Form High-Performance Vehicle Streams. Microscopic Traffic Model Calibration and Validation

Kan, Xingan (David)
Liu, Hao
Shladover, Steven E.
Lu, Xiao-Yun
2018

This report documents the procedures the PATH team has implemented for calibrating the NGSIM oversaturated flow model in the Aimsun micro simulation environment. The goal of the calibration is to identify suitable driving behavior parameters of the NGSIM oversaturated flowmodel, which is used to describe the behaviors of human drivers. With these parameters, the model should be able to reproduce traffic flow patterns like those observed in the 18-km State Route 99 corridor to the south of Sacramento, CA. The Geoffrey E. Havers (GEH) statistic is adopted to quantify the relative difference...

Onboard Monitoring and Reporting for Commercial Vehicle Motor Safety

Cooper, Doug
Dickey, Sue
Johnston, Scott
Kim, ZuWhan
Koo, Thomas
Kretz, Paul
Kuhn, Kenny
Lu, Xiao-Yun
Margulici, JD
Misener, James A.
Nowakowski, Christopher
Robin, Jerry
Spring, John
Walker, Martin
2007

This final report describes the process and product from the project, Onboard Monitoring and Reporting for Commercial Motor Vehicle Safety (OBMS), in which a prototypical suite of hardware on a Freightliner Century Class truck was developed and tested.The OBMS suite allows for online measurement of a set of driving characteristics which are indicators of unsafe driving behavior. These characteristics include speed, following distance, lane keeping performance, safety belt use, and the use of turn signals. Feedback can be provided to the driver, either directly via real time feedback or...

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.

Radio Frequency ID Tags to Enhance Safety

Misener, Jim
Li, Kang
2009

This project was originally conceived and executed to deliver a proof-of-concept of a near-term “cooperative vehicle-highway system” using a Radio Frequency Identification (RFID) tagging system to significantly improve the reliability of rear-end truck-based forward collision warning (FCW) systems. A hardware apparatus was developed but proved difficult and relatively costly to design and prototype; however, one set of RFID apparatus was delivered by our Raytheon subcontractor to PATH, then it was tested at PATH. Because of range limitations it did not perform to the extent that it could...

Experimental Automatic Lateral Control System For An Automobile

Peng, Huei
Zhang, Wei-bin
Arai, Alan
Lin, Ye
Hessburg, Thomas
Devlin, Peter
Tomizuka, Masayoshi
Shladover, Steven
1992

This report summarizes an experimental effort in integrating and testing an automated vehicle lateral control system. The project, a cooperative effort between the California Partners for Advanced Transit and Highway ( PATH) Program and IMRA America, Inc., included a discrete roadway reference system, on-vehicle magnetic sensing system, a computer control system and a hydraulic actuator.

Evaluating System ATMIS Technologies Via Rapid Estimation Of Network Flows: Final Report

Moore, II, James E.
Kim, Geunyoung
Cho, Seongdil
Hu, Hsi-hwa
Xu, Rong
1997

This report studies how flows in large scale transportation networks can be subjected to rapid estimation. It describes an efficient transportation network analysis (TNA) procedure that provides the system-wide changes of network flows under numerous scenario earthquakes. The first objective of this research is to provide reliable estimates of network flows with respect to changes in transportation networks, and to incorporate these changes to the decision-making procedures used by the California Department of Transportation (Caltrans) in making bridge retrofit decisions. The second...

Vehicle Sorting for Platoon Formation: Impacts on Highway Entry and Throughput

Hall, Randolph
Chin, Chinan
2002

This paper develops and evaluates strategies for organizing vehicles into platoons, with the objective of maximizing the distance that platoons stay intact. Fundamentally, this entails grouping vehicles according to their destination. We evaluate various strategies in which vehicles are sorted on entrance ramps, with respect to platoon sizes, throughput and queueing characteristics.