Roads/Highways

Implementation of Advanced Techniques for Automated Freeway Incident Detection

Abdulhai, Baher
Ritchie, Stephen G.
Iyer, Mahadevan
1999

A significant body of research on advanced techniques for automated freeway incident detection has been conducted at the University of California, Irvine (UCI). Such advanced pattern recognition techniques as artificial neural networks (ANNs) have been thoroughly investigated and their potential superiority to other techniques has been demonstrated. Of the investigated ANN architectures, two have shown the best potential for real-time implementation: namely, the Probabilistic Neural Network (PNN), (Abdulhai and Ritchie 1997), and the Multi-Layer-Feed-Forward Neural Network (MLF), (Cheu and...

Automatic Diagnostics of Loop Detectors and the Data Collection System in the Berkeley Highway Lab

May, Adolf
Coifman, Benjamin
Cayford, Randall
Merritt, Greg
2004

This document is the final report for the 2003 Berkeley Highway Laboratory (BHL) project that is part of the University of California's PATH program and supported by the California Department of Transportation (Caltrans). The primary objectives of this project have been to maintain, improve, and conduct research on the BHL detector system. This report contains seven chapters that describe the work undertaken and the results of each task of the project. The first chapter introduces the project, provides a project background, and a site description. The next five chapters describe the...

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
Wang, Zhaoqing
Chen, Bo
2002

In this research project we are developing a roadway detection system that can directly determineO/D data non-intrusively without violating the public's privacy (as in license plate recognitionsystems). While we have previously developed a real-time laser-based non-intrusive detectionsystem for measurement of true travel time on the highway, we improved the system further. Afeed-back loop, using microchip control, was introduced into the system. This makes the systemeasy to use. The mechanical components were also improved to increase the precision of thesystem. Software to display the...

Field Operational Test of Tools for Facilitating Smart Travel Choices Through Real-Time Information

Zhou, Kun
Wang, Yanqiao
Li, Jingquan
Wachs, Marty
Walker, Joan
Meng, Huadong
Friedman, Jason
Zhang, Wei-Bin
2018

This report documents an effort to assess whetherintegrated multimodal real-time traveler information can encouragetravelers to consider transit as a more viable choice. Under the sponsorship of the California Department of Transportationand in partnership with the Los Angeles Metropolitan Transportation Authority,California PATH developed and field tested Trip2go --a suite of web-based and mobile-phone-based applications incorporating real-time transit and highway condition information. Both objective and surveys were collected to support statistical and modeling analyses to evaluate the...

Finding and Analyzing True Effect of Non-recurrent Congestion on Mobility and Safety

Varaiya, Pravin
2007

This report summarizes empirical research about the causes and impact of non-recurrent congestion. A method is presented to divide the total congestion delay in a freeway section into six components: the delay caused by incidents, special events, lane closures, and adverse weather; the potential reduction in delay at bottlenecks that ideal ramp metering can achieve; and the remaining delay, due mainly to excess demand. The method can be applied to any site with minimum calibration, but it requires data about traffic volume and speed; the time and location of incidents, special events and...

Using Cooperative Adaptive Cruise Control (CACC) to Form High-Performance Vehicle Streams

Shladover, Steven E
Nowakowski, Christopher
Lu, Xiao-Yun
Hoogendoorn, Raymond
2014

This research identifies the operational concepts for managing cooperative adaptive cruise control (CACC) vehicle maneuvering and traffic flows. This includes approaches for grouping the CACC vehicles, ranging from ad-hoc to centrally coordinated strategies, and the incentives that could be used to facilitate the vehicle clustering, both operational and financial. These are particularly important at low market penetrations, when the CACC vehicles are likely to be widely separated. The dissolution of CACC strings is also discussed, since this needs to be done carefully to avoid adverse...

Lane Assist Systems for Bus Rapid Transit, Volume III: Interface Requirements

Bu, Fanping
Zhang, Wei-Bin
Dickey, Susan
Shladover, Steven E.
Tan, Han-Shue
2007

Vehicle Assist and Automation (VAA) systems enable lane assist, precision docking and longitudinal control of transit vehicles. They offer the opportunities of providing high quality transit service within reduced lane widths. Transit vehicles in North America are mostly manufactured based on individual transit agencies’ customized requirements. The interfaces between VAA components and the mechanical, electrical and electronic systems on the existing transit vehicle, if not defined properly, can be an impediment to large scale deployment of VAA technologies. This report summarizes a...

Final Report: Mobile Surveillance and Wireless Communication Systems Field Operational Test Volume 3: Appendices A-J Containing Evaluation Data Gathered During the Anaheim Special Event and I-5 Tests

Klein, Lawrence
1999

The Mobile Surveillance and Wireless Communication Systems Field Operational Test(FOT) contained two evaluation tests, the Anaheim Special Event Test and theInterstate-5 (I-5) Test. The Anaheim Special Event Test assessed the ability of thesurveillance trailers to transmit video imagery to a traffic management center in supportof arterial traffic signal control. This test occurred during the Spring of 1997 inconjunction with heavy traffic experienced during hockey playoff games at theArrowhead Pond in Anaheim, CA. The I-5 Test evaluated the ability of the mobilesurveillance and ramp meter...

A General Framework for Verification, Simulation and Implementation of Real-Time Control Algorithms

Eskafi, Farokh H.
1999

We have proposed, investigated, and implemented a general framework for the simulation, verication, and prototyping of control algorithms for intelligent vehicles and highways. The immediate use of such frame work will be in fault management project (MOU288). Prior to this project the protocols and control algorithms developed under MOU288 should have been manually verfied, translated to a simulation language for simulation, and then modified for the QNX real-time operating system for porting to the vehicle's computer. This manual translation process is error prone at every stage. Our...

Freeway Service Patrol Evaluation

Skabardonis, Alexander
Noeimi, Hisham
Petty, Karl
Rydzewski, Dan
Varaiya, Pravin
Al-deek, Haitham
1995

This report presents the findings of a comprehensive evaluation of the freeway service patrol (FSP) program on specific freeway section in the San Francisco Bay Area. The study methodology consisted of determining the savings in incident delay and other performance measures "before" and " after" the implementation of FSP based on field data and improved analysis procedures. Data were collected during the peak periods on a mile section of the I-880 freeway in the City of Hayward, Alameda County. Software was developed to process the field data and create a computerized database. Benefits of...