PATH

Design, Field Implementation and Evaluation of Adaptive Ramp Metering Algorithms

Horowitz, Roberto
May, Adolf
Skabardonis, Alex
Varaiya, Pravin
Zhang, Michael
Gomes, Gabriel
Munoz, Laura
Sun, Xiaotian
Sun, Dengfeng
2005

The main objectives of Task Order 4136 are (1) the design of improved freeway on-ramp metering strategies that make use of recent developments in traffic data collection, traffic simulation, and control theory, and (2) the testing of these methods on a 14-mile segment of Interstate 210 Westbound in southern California. To date, the major accomplishments of this project include (i) the development of a complete procedure for constructing and calibrating a microscopic freeway traffic model using the Vissim microsimulator, which was applied successfully to the full I-210 test site, (ii) a...

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...

Providing In-Vehicle Soft Safety Alerts Using Mobile Millennium Data and Vehicle Event Information

Nowakowski, Christopher
Gupta, Somak Datta
Myers, Scott
Shladover, Steven
Butler, Joe
Bayen, Alex
2012

The Mobile Millennium project provided a platform for aggregating traffic information across various sources, including infrastructure sensors, commercial data feeds, probe vehicles, and probe cell phones. The Networked Traveler project provided the California PATH instrumented research vehicle platform used to both deliver vehicle probe data back to the infrastructure and to generate Advanced Driver Assistance Systems (ADAS) alerts to the drivers of those vehicles. The main theme of this collaboration project was to demonstrate the potential to create Enhanced Probe Vehicles (EPVs) by...

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...

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).

Evaluation of Traffic and Environment Effects on Skid Resistance and Safety Performance of Rubberized Open-grade Asphalt Concrete

Oh, Soon Mi
Ragland, David R.
Chan, Ching-Yao
2010

Wet pavement-related collisions represent a significant traffic safety concern, due in part to the lack of adequate friction between tire and pavement, known as skid resistance. State agencies employ a skid number (SN) system, based on a standard test procedure in which a locked wheel is towed at 40 mph and the skid number (SN40) is calculated from the measured resistance. SN40 is used as a reference value for speeds both greater than and less than 40 mph. For most Departments of Transportation (DOTs) in the nation, excluding California, pavements for which the SN40 is below 30 are deemed...

Improving Mobility Through Enhanced Transit Services: Case Studies for Transit-Taxis

Widmann, Joshua H.
Miller, Mark A.
2006

This report, an interim deliverable for Task Orders 5408 and 6408: “Improving Mobility through Enhanced Transit Services”. Thus far in the study we have performed a review of the literature and conducted a small number of site-specific case studies for transit agencies in North America identified from the literature review as either currently having or in the past having had transit-taxi service implemented in their agency’s jurisdiction. We initially classified alternative concepts of transit-taxis into a typology of three service design options based on a review of the literature: 1)...