Data

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...

An Assessment of Loop Detector and RTMS Performance

Coifman, Benjamin
2004

Traffic detectors support most traffic management applications, so it is important that a detector performs as expected. This study evaluates the performance of four loop sensor models and the Remote Traffic Microwave Sensor (RTMS), adding to the body of sensor performance knowledge through the use of new analytical techniques. The study collected contact closure data from all five of the detectors and concurrent video data. Each loop sensor was deployed following Caltrans guidelines for at least 24 hours across dual loop detectors in each lane of I-80, north of Oakland, CA. The research...

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...

A Vehicle Collision Model for Platoon Controller Development

Tongue, Benson H.
Packard, Andrew
Harriman, Douglas
1997

This is the final report of the research program “Compatibility of Vehicles Within a Platoon (MOU-156).” This research area is continuing under a different, contract and thus, although the work presented herein is complete unto itself, the overall research goals laid out at the beginning of the program will not be attained until the conclusion of the entire related research effort.The material presented in this report provides a description of a simple dynamical model that can be used for determining the physical interaction of vehicles in a collision scenario. Such a model is of use in...

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...

Development and Field Testing of Laser Photodiode Array-Based Vehicle Detection Systems

Cheng, Harry H.
Shaw, Ben
Palen, Joe
Wang, Zhaoqing
Feng, Ping
Nestinger, Stephen
Chen, Bo
2004

Over the past year we have researched the development of a network-based real-time laser-based nonintrusive field-deployable detection for the delineation of moving vehicles. The primary goal of this project is to develop a roadway detection system that can be used to gather reliable travel time data non-intrusively. A powerful Rabbit 3200, instead of multi-microchips, is used to control digitally controlled potentiometers (DCP), which adjust the gain of the sensors' signals. Utilizing digitally controlled potentiometers allow for quick and easy adjustment on the highway with only the need...

Developing Calibration Tools for Microscopic Traffic Simulation Final Report Part 1: Overview Methods and Guidelines on Project Scoping and Data Collection

Zhang, Michael
Ma, Jingtao
1998

The purpose of MOU-233 is to evaluate and test a low cost, short range radar sensor developed by Amerigon corporation through a subcontract with the University of Southern California. The radar is designed to be used as a ranging sensor for automatic vehicle following applications. It is intended to be mounted in the front of the vehicle and provide measurements of the distance between the front of the vehicle and the rear of any vehicle or object ahead within a maximum distance of 17 feet. The output of the radar as supplied by Amerigon, is a 32-bit binary code, using one bit to represent...

Fault Diagnosis for Intra-platoon Communications

Simsek, Hidayet Tunc
Sengupta, Raja
Yovine, Sergio
Eskafi, Farokh
1999

We are interested in studying the fault diagnostics of platooning vehicles. It is understood that a platoon is a string of vehicles with distributed control strategies. Vehicles rely on real-time control data from other vehicles for correct execution of their control laws. A time-driven system is responsible for delivering the control data.

Enhancements of ATMIS Using Artificial Intelligence

Liu, Henry X.
Recker, Will
2002

PARAMICS is one of the widely used microscopic traffic simulation program. One important feature of PARAMICSis that PARAMICS allows the user to customize many features of underlying simulation model through a Functional Interface or Application Programming Interface (API). We have developed a library of plug-in modules to enhance the capabilities of PARAMICS simulation through API. These API modules include actuated signal control, time-based ramp meter control, path-based routing, loop data aggregator, performance measures, MYSQL database connection, and network communication through...

Definition and Measurement of Transportation System Performance

Dahlgren, Joy
1998

Performance measures are needed to inform decisions regarding the overall level of resources to devote to transportation, where to allocate these resources, and how best to use them. The first two types of decision require regular monitoring of the system to reveal problems, which present opportunities for improvement. A few, easily measured indicators of the major benefits and costs of the system are appropriate for this task. For the third type of decision, how to best address a specific problem, a more comprehensive set of benefits and costs must be considered. Indicators must be found...