PATH

Calibration of VISSIM for a Congested Freeway

Gomes, Gabriel
May, Adolf
Horowitz, Roberto
2004

A procedure for constructing and calibrating a detailed model of a freeway using VISSIM is presented and applied to a 15-mile stretch of I-210 West in Pasadena, California. This test site provides several challenges for microscopic modeling: an HOV lane with an intermittent barrier, a heavy freeway connector, 20 metered onramps with and without HOV bypass lanes, and three interacting bottlenecks. Field data used as input to the model was compiled from two separate sources: loop-detectors on the onramps and mainline (PeMS), and a manual survey of onramps and offramps. Gaps in both sources...

Multiple ICM Management: Task ID 3706 (65A0764), Final Report

Patire, Anthony PhD
Dion, Francis PhD
2022

In order to improve corridor network operations, the vision of integrated corridor management (ICM) is to identify corridor managers who serve as experts for individual corridors, and to enable these managers to oversee corridor operations, to coordinate with partner agencies, and to improve collaborative, multiagency planning. While it makes sense to manage freeways, arterials, and transit in a coordinated way within a corridor, it is less clear how multiple corridors interact with each other, and how incidents and response plans along one corridor impacts a nearby corridor or multiple...

Institutional Aspects of Multi-Agency Transit Operations

Miller, Mark A.
Lam, Amy
2003

In this project we have investigated the institutional changes that have been undertaken recently by transit properties to work more closely - in partnership and coordination rather than in competition - with other regional public agencies (especially including other transit properties) to help address mutual transportation problems from a regional and less parochial perspective. Our investigation includes case studies both within and outside of California. From the case studies, both formal and informal mechanisms are used to forge strong regional coordination linkages. Several key...

Integrated Maneuvering Control For Automated Highway Systems Based On A Magnetic Reference/sensing System

Tomizuka, Masayoshi
Hedrick, J. Karl
Pham, Hung
1995

In this report, a combined longitudinal and lateral eighteen-state vehicle chassis, engine, and drive train model is developed and validated against existing longitudinal-only and lateral-only vehicle models. The full-size model is simplified to a three-state model to facilitate controller design. The control task in a combined maneuver is defined as the simultaneous regulation of the vehicle's longitudinal and lateral spacings through the application of throttle and steering. Two forms of a Sliding control law are derived based on the reduced order model. One version is decoupled in the...

Commercial Vehicle Operations In Intermodal Transportation Management Centers

Hall, R.
Intihar, C.
1997

The report documents findings from a series of studies investigating the role of commercial vehicle operations within inter-modal transportation management centers. The study concludes that there exists no strong market push to better integrate motor carrier operations with governmental agencies in California today. As companies adopt ITS technologies for vehicle tracking and wireless communication, they are clearly not pushing for electronic transfer of information to and from governmental agencies. Likewise, none of the companies in the vehicle tracking industry has given priority to...

Studies Of Road Infrastructure Requirements For Small Innovative Vehicles

Garrison, William L.
1993

This is the final report of Phase I studies of road infrastructure requirements for small innovative highway vehicles. Project reports previously published provide statements of approaches and findings, and these provide the basis for the present report which strives for clarification-stocktaking objectives. This study was triggered by General Motors Corporation investigations of the feasibility of marketing a relatively inexpensive single occupant, high performance, fuel efficient vehicle known as the Lean Machine.

Fault Diagnosis and Safety Design of Automated Steering Controller and Electronic Control Unit (ECU) for Steering Actuator

Tan, Han-Shue
Bu, Fanping
Koo, Shiang-Lung
Zhang, Wei-Bin
2005

This final reports the fault analysis of precision docking system and safety design of the safety critical elements for precision docking system. The report includes three Parts, including:Part I provides a description of the Precision Docking System and reports analysis for fault diagnosis and safety design of automated steering controller and Electronic Control Unit (ECU) for steering actuator. It also reports a demonstration PATH conducted during the National Intelligent Vehicle Initiative demonstration organized by the US Department of Transportation Joint Program Office.Part II report...

Towards an Accessible City: Removing Functional Barriers to Independent Travel for Blind and Vision-Impaired Residents and Visitors

Golledge, Reginald G.
Marston, James R.
1999

This study examined the effect that use of Remote Infrared Signage Systems has on performance of blind or vision impaired people when undertaking a variety of bus user tasks, including finding a suburban bus stop, identifying a specific bus and boarding it, disembarking at the downtown terminal and finding the entrance, traversing the terminal and learning the location of facilities inside and simulating the exiting of a buss.

Evaluation of the OCTA Transit Probe System

Hall, Randolph W.
Vyas, Nilesh
Shyani, Chintan
Sabnani, Vikas
Khetani, Simit
1999

The OCTA (Orange County Transit Authority) Transit Probe Project is a field operational test of an automatic-vehicle-location (AVL) system operating in Orange County, California. This report presents the final evaluation results for the project, concentrating on the operational period from June 1, 1998 to May 30, 1999. The report provides a detailed description of the system and the motivation for its design. It provides analyses of data reliability and accuracy, and analysis of the usefulness of transit probe data for predicting automobile travel times. Institutional issues are evaluated...

An Efficient Lane Change Maneuver for Platoons of Vehicles in an Automated Highway System

Horowitz, Roberto
Tan, Chin-Woo
Sun, Xiaotian
2004

The current lane change maneuver for vehicles in a platoon under the California PATH automated highway system (AHS) architecture is inefficient, because the follower has to split from the rest of the platoon before making a lane change. In this report, we propose to add a lane change within platoons maneuver that allows a follower to change lanes and be inserted into another platoon directly without splitting either platoon. This maneuver is performed by aligning and locking the longitudinal positions of the two platoons in adjacent lanes. The estimated improvement in the AHS utilization,...