PATH

Effectiveness of the Mobility Pass Program in San Diego

Rea, Louis
Ryan, Sherry
2007

The purpose of this research is to assess the effectiveness on individual travel behavior as a result of using combined car-sharing and transit passes. This assessment was based upon participation in a mobility pass program or Compass + Pass Program that was implemented in late 2004 in the San Diego region. Program participants were highly satisfied for having an alternative to the drive-alone commute. This key finding points to the fact that there is some level of latent demand for alternatives to the drive alone commute, especially in corridors with heavy peak hour congestion. Also of...

Advanced Image Sensing Methods for Traffic Surveillance and Detection

MacCarley, Art
1999

This report describes the results of a PATH-funded study conducted by the Cal Poly Transportation Electronics Laboratory intended to assess advanced imaging technologies for potential application toroadway surveillance and detection. A major motivation for this study was the possibility of improvedvisibility under conditions of fog or dust using wavelengths longer than that of the visible spectral band. Technologies considered included ten types of infrared video cameras and one millimeter-wave still-frame imaging system. Evaluation criteria were structured to reflect the surveillance...

A Statewide Optimal Resource Allocation Tool Using Geographic Information Systems, Spatial Analysis, and Regression Methods

Goulias, Konstadinos G.
Golob, Thomas F.
Yoon, Seo Youn
2008

The overall objective of this project is to develop an optimal resource allocation tool for the entire state of California using Geographic Information Systems and widely available data sources. As this tool evolves it will be used to make investment decisions in transportation infrastructure while accounting for their spatial and social distribution of impacts. Tools of this type do not exist due to lack of suitable planning support tools, lack of efforts in assembling data and information from a variety of sources, and lack of coordination in assembling the data. Suitable planning...

Improved Analysis Methodologies and Strategies for Complete Street

Fournier, Nicholas
Huang, Amy
Skabardonis, Alexander
2021

Complete streets movement is a national effort to return to traditional streets in our cities to enhance livability, safely, accommodate all modes of travel, provide travel choices, ease traffic congestion, and promote healthier communities. The California Department of Transportation (Caltrans) and several local agencies in the State have developed implementation plans for complete streets. In this project, we developed and tested improved strategies and analysis methodologies for complete streets, taking into consideration the emerging advances in technology on control devices and data...

PEDAMACS: Power Efficient and Delay Aware Medium Access Protocol for Sensor Networks

Coleri, Sinem
Varaiya, Pravin
2004

We consider a class of sensor networks with two special characteristics. First, the nodes periodically generate data for transfer to a distinguished node called the access point. Second, the nodes are (transmit) power and energy limited, but the access point, which communicates with the ‘outside world’, is not so limited. Such networks might be used for instance when a geographically distributed physical process, such as traffic on a freeway or at an urban street intersection, is periodically sensed for purposes of process control. We propose a medium access control scheme, called PEDAMACS...

Models Of Vehicular Collision: Development And Simulation With Emphasis On Safety I: Development of a Model for a Single Vehicle

O'reilly, Oliver M.
Papadopoulos, Panayiotis
Lo, Gwo-jeng
Varadi, Peter C.
1997

This report outlines the development of a novel model for a single vehicle. The model uses a theory of a deformable medium which is known as a Cosserat point to model the deformation of the body of the vehicle. This theory is supplemented with various developments from vehicle system dynamics. The complete set of ordinary differential equations governing the vehicle's motion are presented and numerical simulations of the model under various operating conditions are discussed.

Safety Performance and Robustness of Heavy Vehicle AVCS

Taylor, R. Jemonde
Yih, Paul
Gerdes, J. Christen
2005

Dynamically, heavy trucks are inherently different than passenger cars. In addition to the increase rollover risk arising from an elevated center of gravity height, heavy trucks possess additional failure modes such as jackknifing and excessive trailer swing. As a response to these issues, significant research has been performed in the last three decades to establish safety metrics for heavy trucks based on dynamic testing. This research has had an impact on determining acceptable size and weight restrictions for heavy vehicles and on the actual design of heavy trucks for increased safety...

Evaluation of Bus and Truck Automation Operations Concepts

Tsao, H. S. Jacob
Zhang, Lan
Lin, Lin
Batni, Deepa
2004

Traffic congestion will continue to worsen and likely worsen at a faster rate than ever. People throughput and freight throughput have become critical issues for California and the rest of the nation. PATH has funded with approximately $125K a research project entitled "Evaluation of Bus and Truck Automation Scenarios" jointly proposed by Jan Botha (Principal Investigator) of Department of Civil and Environmental Engineering and Jacob Tsao (Co-PI) of Department of Industrial and Systems Engineering at San Jose State University. This report summarizes the major findings of the research...

Modeling And Control Design For A Computer Controlled Brake System

Raza, H.
Xu, Z.
Ioannou, P.
Yang, B.
1995

In this paper, the problem of modeling and control design of a computer controlled brake system is addressed. A nonlinear model for the brake system is developed by analyzing the input-output data obtained from the test bench. A controller for the brake system is designed by applying feedback linearization techniques along with intuitive modifications to meet the closed loop specifications.

Testing and Evaluation of Robust Fault Detection and Identification for a Fault Tolerant Automated Highway System

Chen, Robert H.
Ng, Hok K.
Speyer, Jason L.
Mingori, D. Lewis
2002

This report concerns vehicle fault detection and identification. A vehicle health monitoring approach based on analytical redundancy is described. To detect and identify actuator and sensor faults, fault detection filters and parity equations are developed for the longitudinal dynamics of the PATH Buick LeSabre. Fault detection filters and parity equations use the control commands and sensor measurements to generate the residuals which have a unique static pattern in response to each fault. This allows the faults not only to be detected, but also identified. Fault detection filters and...