PATH

Commercial Motor Vehicles' Safety - A California Perspective

Giuliano, Gen
Zhou, Jiangping
McFerrin, Peter
Miller, Mark A.
2010

This report presents the findings of an examination of commercial motor vehicle crashes in California. Initially, a review of the basic descriptive statistics associated with truck-involved crashes in California was conducted; it covered the time period between January 1995 and December 2004 based on the Statewide Incident Tracking and Reporting System (SWITRS) data base, which contains information about every single motor vehicle accident in the state reported to a law enforcement agency. In addition to examinations of the entire population of truck-involved crashes in the state over the...

Cooperative Adaptive Cruise Control: Testing Drivers’ Choices of Following Distances

Nowakowski, Christopher
Shladover, Steven E.
Cody, Delphine
Bu, Fanping
O’Connell, Jessica
Spring, John
Dickey, Susan
Nelson, David
2010

A Cooperative Adaptive Cruise Control (CACC) system has been developed by adding a wireless vehicle-vehicle communication system and new control logic to an existing commercially available adaptive cruise control (ACC) system. The CACC is intended to enhance the vehicle-following capabilities of ACC so that drivers will be comfortable using it at shorter vehicle-following gaps than ACC. This can offer a significant opportunity to increase traffic flow density and efficiency without compromising safety or expanding roadway infrastructure.This report describes the design and implementation...

Low Speed Collision Dynamics: Second Year Report

Tongue, Benson
Moon, Ahrie
Harriman, Doug
1996

The goal of this project is to develop a user-friendly simulation program which will allow the study of platoon dynamics in both nominal and emergency scenarios. The report discusses the issues investigated during the second phase of the project, including the inclusion of a vehicle model with an engine model, transmission model, a combined lateral and longitudinal controller, and a more detailed collision dynamics model. The overall simulation program includes individual modules that supply control input force, aerodynamic drag force, and road-tire interaction forces.

Evaluation of the Effects of Intelligent Cruise Control Vehicles in Mixed Traffic

Ioannou, Petros
2003

This is the final report for the project entitled "Evaluation of the Effects of Intelligent Cruise Control Vehicles in Mixed Traffic". The project was initially under MOU392 and switched to Task Order 4217 at the beginning of the 2nd year of the project. Due to this administrative change a final report was submitted to PATH for MOU392 covering all the tasks completed during the 1st year of the project. The two research tasks that were not completed under MOU392 became the main focus of Task Order 4217.

Dynamic All-Red Extension at Signalized Intersection: Probabilistic Modeling and Algorithm

Zhang, Liping
Zhou, Kun
Zhang, Wei-Bin
Misener, James A.
2011

Dynamic All-Red Extension (DARE) has recently attracted research interest as a non-traditional intersection collision avoidance method. We propose a probabilistic model to predict red light running (RLR) hazard for dynamic all-red extension system. The RLR hazard, quantified by a predicted encroachment time, has contributory factors including the speed, distance and car-following status of the violator and the empirical distribution of the entry time of conflict traffic. An offline data analysis procedure is developed to set the parameters for RLR hazard prediction. Online-wise, a two-...

A Low-cost Wireless MeMS System for Measuring Dynamic Pavement Loads

Varaiya, Pravin
2008

Work done under this "Innovative Proposal" may be summarized as follows. A closed-form series solution is provided for the displacement of a pavement loaded by a truck modeled as an Euler beam with elastic foundation under a moving load. A method is developed to estimate the load based on accelerometer measurements. Lastly, it was found that the measurement system that we built was not suited for the problem at hand because the accelerometer bandwidth was too high and the system could not isolate the accelerometer from ambient noise. This led to a new measurement system design. However,...

Enabling Accelerated Installation of Aftermarket On-Board Equipment for Connected Vehicles

Chan, Ching-Yao
2012

This report summarizes previous findings and describes recent developments with regards to rapid introduction of aftermarket on-board equipment (OBE) devices for connected vehicles to the vehicle fleet. An integration assessment for aftermarket OBE devices will be discussed. An analysis of outside market forces that may affect driver adoption of connected vehicle technologies is shared. Finally, recommendations are provided for strategic approaches to foster the rapid introduction of aftermarket OBE devices and garner consumer interests to purchase these devices.

Cooperative Adaptive Cruise Control (CACC) for Truck Platooning: Operational Concept Alternatives

Nowakowski, Christopher
Shladover, Steven E.
Lu, Xiao-Yun
Thompson, Deborah
Kailas, Aravind
2015

Cooperative Adaptive Cruise Control (CACC) provides an intermediate step toward a longer-term vision of trucks operating in closely-coupled automated platoons. There are important distinctions between CACC and automated truck platooning. First, with CACC, only truck speed control will be automated, using vehicle to vehicle (V2V) communication to supplement forward sensors. The drivers will still be responsible for actively steering the vehicle, lane keeping, and monitoring roadway and traffic conditions. Second, while truck platooning systems have relied on a Constant Distance Gap (CDG)...

Evaluation of the Bay Area Incident Response System (BAIRS)

Mauch, Michael
Chung, Koohong
Ahn, Soyoung
Skabardonis, Alexander
2006

The Bay Area Incident Response System (BAIRS) is an integrated Web and GIS based incident tracking system that provides tools to improve California’s Department of Transportation (Caltrans) incident management capabilities. Currently, BAIRS aids District 4 Maintenance respond to and track over 33,000 incidents per year throughout the San Francisco Bay area.The report presents the findings from the evaluation of the BAIRS system based on field data on incidents and traffic conditions. Through the implementation of BAIRS, incident response and clearance times were reduced by about 15%....

San Diego I-15 Integrated Corridor Management (ICM) System: Stage II (Analysis, Modeling, and Simulation)

Miller, Mark A.
Skabardonis, Alexander
2010

This report describes the Stage II work –Analysis, Modeling, and Simulation(AMS) – to date of the US Department of Transportation’s (DOT) federally-sponsored Integrated Corridor Management (ICM) Program for the I-15 Corridor in San Diego County, California, between State Route 163in the city of San Diego and State Route 78 in the city of Escondido. Stage II of the federal ICM Program involves performing the analysis, modeling, and simulation work for the I-15 corridor in San Diego County. Major tasks in Stage II consist of data collection, tools and software support, models validation and...