Roads/Highways

Anonymous Vehicle Tracking for Real-Time Freeway and Arterial Street Performance Measurement

Ritchie, Stephen G.
Park, Seri
Oh, Cheol
Jeng, Shin-Ting (Cindy)
Tok, Andre
2005

This research involved an important extension of existing field-implemented and tested PATH research by the authors on individual vehicle reidentification, to develop methods for assessing freeway and arterial (and transit) system performance for the Caltrans PeMS (Performance Measurement System). PeMS has been adopted by Caltrans as the standard tool for assessing freeway system performance, but lacks capabilities for assessing arterial and transit system performance, and strategies that combine freeways, arterials and/or transit and commercial vehicle fleets. It was shown that the...

Optimal Emergency Maneuvers Of Automated Vehicles

Shiller, Zvi
Sundar, Satish
1996

This work addresses two issues related to emergency maneuvers of autonomous vehicles. The first concerns the time-optimal speeds along specified path, which can be used to design emergency maneuvers. The second concerns the computation of optimal lane-change maneuvers for on- line collision avoidance. Although considering only a simple planar vehicle model, this work provides insights into the dynamic behavior of ground vehicles

Lateral Guidance System Requirements Definition

Parsons, Robert E.
Zhang, Wei-Bin
1988

The Institute of Transportation Studies (ITS) is assisting the California Department of Transportation (CALTRANS) to establish and conduct a program of advanced highway technology R&D to obtain better productivity from the States’ most used highway segments. The Program on Advanced Technology for the High-way, PATH, centers on advanced technology opportunities that may contribute to the relief of traffic congestion, with related problems of air pollution and parking; and on energy for transportation, in particular continued use of petroleum based fuels.

Unified Lateral Motion Control Of Vehicles For Lane Change Maneuvers In Automated Highway Systems

Chee, Wonshik
Tomizuka, Masayoshi
1997

This report deals with the lateral guidance of vehicles, with focus on lane change maneuvers. Two approaches are presented for lane changes maneuvers. The first is to treat the maneuvers as a tracking control problem. A virtual desired trajectory (VDT) is used a tracking control approach. The second is to use a unified lateral guidance algorithm which consists of the desired yaw rate generator and the yaw rate tracking controller.

Robust Lateral Control of Heavy Duty Vehicles

Tai, Meihua
Wang, Jeng-Yu
White, Ryan
Tomizuka, Masayoshi
2001

In this report, achievements under MOU385, robust lateral control of heavy vehicles for automated highway systems are presented. The purpose of this project are: to design new controllers or redesign existing controllers for lateral control of heavy vehicles to improve performance; to evaluate designed controllers by experiments and to study autonomous vehicle following control. Toward this goal, we have obtained three main results during year 2000-2001, which are presented in this report.

New Hardware and Software Design of a Field-Deployable Real-Time Laser-Based Non-Intrusive Detection System for Measurement of True Travel Time on the Highway

Cheng, Harry H.
Shaw, Ben
Palen, Joe
Lin, Bin
Hu, Xudong
Chen, Bo
Parks, Jason
2001

A new version of a field-deployable real-time laser-based detection system has been developed using new techniques of electronics and optics. The laser-based non-intrusive detection system uses a laser line that is projected onto the ground as a probe. The reflected light is collected and focused into a photodiode array by an optical system. Vehicle presence is detected based on the absence of reflected laser light. By placing two identical laser/sensor pairs at a known distance apart, the speeds of both the front and rear of a vehicle are measured based on the times when each sensor is...

Bay Area Simulation and Ramp Metering Study

Gardes, Yonnel
May, Adolf D.
Dahlgren, Joy
Skarbardonis, Alex
2002

This research project focuses on the investigation of a portion of the southbound morning peak I-680 freeway facility, between I-580 in Pleasanton and SR 237 in San Jose. The project provided an opportunity for testing the Paramics model capabilities to replicate freeway traffic conditions, and assess to what extend the existing model can simulate various operational strategies such as HOV lanes and ramp metering.

Section Related Measures of Traffic System Performance: Final Report

Ritchie, Stephen
Sun, Carlos
1998

This project describes a new set of advanced traffic surveillance techniques that are based on inductive vehicle waveforms and pattern recognition technology. Focus is on demonstrating and evaluating a new method for obtaining true selection related performance measures, such as section travel time and section density, for freeways. The report also discusses methods for the measurement of lane-by-lane traffic movement and specific origin/destination demands.

Optimal Sensor Requirements

Ban, Xuegang (Jeff)
Bayen, Alexandre
Chu, Lianyu
Danczyk, Adam
Herrera, Juan‐Carlos
Herring, Ryan
Liu, Henry X.
Margulici, J.D.
Tossavainen, Olli‐Pekka
Work, Daniel
2009

PATH Task ORder 6328 addresses the optimal deployment of traffic detectors on freeway to ensure that adequate information is collected at the lowest possible cost. The project team produced a study framework and tools that can be applied locally to test the sensitivity of traffic data quality to detectors location and spacing, and ultimately recommend a deployment plan.Various types of traffic detectors, including loop detectors, radars, toll tag readers and video cameras are deployed on highways. They provide the data needed to run traffic management applications such as ramp metering...

Assessing Automated Speed Enforcement in California

Chan, Ching-Yao
Li, Kang
Lee, Joon-Ho
2010

Speeding is known to be related to a significant portion of highway collisions. As part of the efforts to seek safety improvements of the California highway network, the California Department of Transportation (Caltrans) is exploring the implementation issues of automated speed enforcement (ASE). This report provides an overview of Task Order 6212 undertaken by California PATH to assess various issues associated with ASE systems.An ASE system designed for use in work zones was acquired and tested in several field experimental sites, along with several other commercially-off-the-shelf...