PATH

Enhanced AHS Safety Through the Integration of Vehicle Control and Communication

Hedrick, J. K.
Sengupta, R.
Xu, Q.
Kang, Y.
Lee, C.
2003

In fiscal year 2002/2003 we finished the study of the effect of vehicle-vehicle/vehicle-roadside communication on the performance of adaptive cruise control (ACC) systems. Two simulation studies were finished. The first is a single ACC vehicle simulation using MATLAB/SIMULINK. A cut-in scenario and a braking scenario are tested. Communication greatly saves control effort in the former scenario, while it has little effect in the latter. The other work simulates ACC controlled highway merging using SHIFT language. The results show the beneficial effects of communication in terms of the...

Enhanced AHS Safety Through the Integration of Vehicle Control and Communication

Hedrick, J. K.
Sengupta, R.
Xu, Q.
Kang, Y.
Lee, C.
2003

In fiscal year 2002/2003 we finished the study of the effect of vehicle-vehicle/vehicle-roadside communication on the performance of adaptive cruise control (ACC) systems. Two simulation studies were finished. The first is a single ACC vehicle simulation using MATLAB/SIMULINK. A cut-in scenario and a braking scenario are tested. Communication greatly saves control effort in the former scenario, while it has little effect in the latter. The other work simulates ACC controlled highway merging using SHIFT language. The results show the beneficial effects of communication in terms of the...

Methodologies For Assessing The Impacts Of Highway Capacity Enhancements On Travel Behavior

Dahlgren, Joy
1998

Acceptance of ITS components that are designed to increase capacity will hinge on the extent to which additional capacity induces additional travel. This study addressed methodologies for studying the effects of capacity on travel: 1) before and after studies or travel times and volumes in corridors in which capacity had been increased, 2) surveys of users of routes on which capacity had been increased, and 3) statistical changes in county VMT as a function of freeway capacity. On I-80 in the Bay Area, the site selected for the investigation, travel times and volumes were quite variable....

Modeling IVHSEmission Impacts Volume II: Assessement Of The Caline 4 Line Source Dispersion Model

Washington, Simon
Guensler, Randall
Sperling, Daniel
1994

This report assesses the ability of the emission estimating algorithms contained in version 4 of the CALINE line source dispersion model developed by Caltrans (CALINE 4) to accurately predict carbon monoxide emissions from a fleet of motor vehicles. The CALINE 4 model contains algorithms that predict carbon monoxide emissions from discrete modal events of idle, cruise, acceleration, and deceleration. The modified CALINE 4 model algorithms are used to predict CO impacts of an applied intelligent vehicle and highway system concept, automatic vehicle identification applied to electronic...

Testing Daganzo's Behavioral Theory for Multi-lane Freeway Traffic

Chung, Koohong
Cassidy, Michael
2002

This report describes the detailed, albeit still preliminary study of traffic on stretches of two different freeways. Both were plagued by merge bottlenecks. The first of these sites is the Gardiner Expressway, a 3.3 km long freeway stretch in Toronto, Canada. The site was selected because of its suitable geometry (i.e. its merge bottleneck) and its well-tuned loop detectors located upstream and downstream of the bottleneck. The site thus provided for an exceptionally good “laboratory” for testing Daganzo’s behavior theory of drivers (Daganzo, 1999). It turns out that the observations from...

Truck Scheduling for Ground to Air Connectivity

Hall, Randolph W.
2001

A critical link in the overnight package business is the on-time arrival of trucks at airport terminals. Truck delays can delay the package sorting and transfer process, which can in turn delay aircraft departures from the local terminal, as well as aircraft departures from hub terminals that depend on timely aircraft arrivals. This paper models the airport terminal as a queueing process with random bulk arrivals. Predictions are provided for expectation, and standard deviation, of arrived work. From these predictions performance measures are developed for sort end-time and sort starvation...

Evaluating the Impact of ITS on Personalized Public Transit

Dessouky, Maged M.
Hall, Randolph W.
Shah, Rutvij
Aldaihani, Majid
2001

The focus of this project is to study alternative system architectures and ITS technologies that can improve the efficiency of personalized public transit and demand responsive systems such as paratransit. This interim report reviews available and emerging ITS technologies that have been deployed or are being considered for this industry. We also conducted a survey of commercially available computer aided dispatching software. We list the numerous features offered by these software packages. Also, included in this interim report is a statistical analysis of travel patterns of a paratransit...

Path ATMIS/Systems State of the Research: Annual Report Fiscal Year 1997/1998

Tam, Robert
1998

This report presents a summary of California PATH Advanced Traffic Management and Traffic Information Systems (ATMIS) and Systems research for FY 1997-1998. For each project, a brief description is given of the objectives, status outline, and principal results. The report is organized into the following research topics: Surveillance Systems, Traffic Management Systems, Traffic Modeling, Traveler Information Systems, Public Transportation Systems, and System Integration and Benefit/Cost Analysis.

Evaluation of On-ramp Control Algorithms

Jin, Wenlong
Zhang, Michael
2001

A freeway corridor consists of the freeway and its entrance/exit ramps, the cross streets, and adjacent parallel arterial streets. It is designed to provide a generally high level of service (LOS) to their users and to the communities which they serve. However, many corridors in the country are congested, with the worst congestion problems usually arising during the two peak periods(morning and evening) (Schrank and Lomax, 1999). =There are two types of traffic congestion observed: recurrent and non-recurrent. Recurrent congestion are due to excessive peak demands and non-recurrent...

The Naturalistic Driver Model: Development, Integration, and Verification of Lane Change Maneuver, Driver Emergency and Impairment Modules

Cody, Delphine
Tan, Swekuang
Caird, Jeff K.
Lees, M.
Edwards, C.
2008

This report documents work conducted in order to support the development of a driver model. This work consisted of (i) a review of driver models for identifying the possibility to add some functionalities to the current model based on existing models and (ii) the data collection and analysis in order to describe the mechanism of distraction and potentially offer some quantification of its effect on drivers’ behavior and performance.