PATH

A Review of the Optimized Policies for Adaptive Control Strategy (OPAC)

Liao, Lawrence C.
1998

Optimized Policies for Adaptive Control (OPAC) is a real-time demand-responsive traffic signal timing optimization algorithm for individual intersections. It was developed at University of Lowell under the sponsorship of U.S. Department of Transportation in the early 80s. OPAC distinguishes itself from traditional cycle-split signal control strategies by dropping the concept of cycle. In OPAC, the signal control problem consists of a sequence of switching decisions made at fixed time intervals. At each decision point the question is whether to extend or terminate current phase. Dynamic...

Experimental Vehicle Platform for Pedestrian Detection

Chan, Ching-Yao
Bu, Fanping
Shladover, Steven
2006

This report documents the work conducted for PATH Task Order 5200 – the evaluation of sensor technologies for pedestrian detection. A survey of recent and available sensor products were selected and evaluated to assess their applicability for vehicle-based solutions. The performance characteristics and limitations of various products and technological approaches were investigated. Subsequently, demonstrative experimental vehicle platforms and testing facilities were developed to illustrate the concept of vehicle infrastructure integration.

Using Cooperative Adaptive Cruise Control (CACC)to Form High-Performance Vehicle Streams. Definitions, Literature Review and Operational Concept Alternatives

Shladover, Steven E.
Nowakowski, Christopher
Lu, Xiao-Yun
2018

Cooperative Adaptive Cruise Control (CACC) is a term that has been used rather loosely in recent years, such that different people visualize different functions and capabilities when discussing CACC systems. Thus, there are now multiple system concepts that have been described under the CACC label, and the functionalities included in these varied concepts can be quite different from each other. At the heart of each CACC concept is the merging of Adaptive Cruise Control (ACC), a subset of the broader class of automated speed control systems, with acooperative element, such a Vehicle-to-...

Smart Parking Management Field Test: A Bay Area Rapid Transit (BART) District Parking Demonstration; Final Report

Rodier, Caroline J., PhD
Shaheen, Susan A., PhD
Kemmerer, Charlene
2008

This report presents an evaluation of the first transit-based smart parking project in the U.S. at the San Francisco Bay Area Rapid Transit (BART) District station in Oakland, California. The report begins with a review of the smart parking literature; next the smart parking field test is described including its capital, operational, and maintenance costs; then the results of the participant survey analysis are presented; and finally lessons learned from the institutional, user, and operational perspective are documented. Some key changes in participant travel behavior include increases in...

Platoon Collision Dynamics And Emergency Maneuvering IV: Intra-platoon Collision Behavior And A New Control Approach For Platoon Operation During Vehicle Exit/entry - Final Report

Tongue, Benson H.
Yang, Yean-tzong
1994

This report examines platoon behavior during non-nominal operations, most especially due to emergency braking. Three main topics are discussed: multiple-collision wave propagation effects for homogeneous platoons with and without lead vehicle information, intra-platoon collision behavior of non-homogeneous platoons during emergency operations, and a new control approach for platoon operations during vehicle exit/entry.

Observations On European Advanced Traveler Information And Traffic Management Systems

Yim, Youngbin
Ygnace, Jean-luc
1993

This report documents the current state of Intelligent Vehicle Highway Systems (IVHS) technologies in Europe with special attention to advanced traveler information systems (ATIS) and advanced traffic management systems (ATMS). The views presented in the report are largely derived from information gathered at two conferences and from personal interviews with researchers and government authorities engaged in the European IVHS research effort. The report is organized into three sections: a brief description of the DRIVE I program, the current state of the DRIVE II program, and the status of...

System Fault Detection in Human-Augmented Automated Driving

Cohn, Theodore
2001

Lateral control of a vehicle in the Automated Highway System (AHS) has been formulated and simulated as part of the hierarchical AHS control structure. In that structure, lateral control resides in the vehicle, and is implemented as a closed-loop control system with the lateral deviation of the vehicle from a reference position as a controlled variable and the steering angle or its rate as a controlling input. The PATH AHS scenario has assumed a road reference and sensing system based on magnetic markers equally spaced along a highway lane. Freedom in the selection of the polarity of each...

Exploratory Field Test of Early Fleet Niches for Hydrogen Fuel Cell Vehicles and Fueling Infrastructure

Martin, Elliot
Shaheen, Susan A., PhD
Lipman, Timothy E., PhD
Lidicker, Jeffrey
2009

Over the last several decades, hydrogen fuel cell vehicles (FCVs) have emerged as a zero tailpipe-emission alternative to the battery electric vehicle (EV). There are key questions about consumer reaction and response to operations and refueling of FCVs. This report presents the results of a “ride-and-drive” clinic series (n=182) held in 2007 with a Mercedes-Benz A-Class “F-Cell” hydrogen FCV. The clinic evaluated participant reactions to driving and riding in an FCV, as well as witnessing a vehicle-refueling event. The respondents entered the clinic with a strong interest in alternative...

Development of an Adaptive Corridor Traffic Control Model

Recker, Will
2008

This report documents work performed on PATH TO 5323. Due to an administrative mandate, the work performed and reported herein constitutes only the early stages of the multi-year project that was approved under PATH TO 5323, and subsequently divided into two distinct awards—TO 5323 and TO 6323. Moreover, a series of events during the early stages of the project substantially redirected the original effort. These factors led to a major redirection from the original project. The majority of the work performed under the revised TO 5323 was then to develop a methodology consistent with the new...

Onboard Monitoring and Reporting for Commercial Vehicle Safety (OBMS) Phase II: Field Operational Test

Misener, Jim
Nowakowski, Christopher
O'Connell, Jessica
Murray, John
2008

Each year in the United States over 450,000 large trucks are involved in crashes, resulting in about 5000 fatalities and 120,000 injuries. Significantly, truck driver error is a major causal factor to truck-involved crashes. This points toward onboard monitoring as a promising means to encourage good driving behavior, it would recognizing and provide necessary feedback to correct self-induced hazardous driving situations. This is the basis for our past prototype development effort, which has produced under Task Orders 5509 and 6609 a suite of hardware on a Freightliner Century Class.This...