PATH

Reservation, Scheduling, and Navigation System for a Checkpoint DRT Service

Li, Yuwei
Foletta, Nicole
Elkabany, Ken
Yang, Fan
Wee, Anthony
Cassidy, Michael
2007

The report fully documents a prototype system that has been developed to serve Demand-Responsive Transit (DRT). The DRT service is provided by means of buses and has been proposed for deployment (as a pilot project) in Fremont, California. The service itself is to be deployed in a “hybrid” fashion; i.e., service alternates between a traditional fixed-route mode and the DRT mode from one bus trip to the next.The report describes the prototype systems from the perspective of the system users (i.e., customers, bus drivers and administrators). Further, the report describes system configuration...

Vehicle Modeling And Control For Automated Highway Systems

Hedrick, J. K.
McMahon, D. H.
Swaroop, D.
1993

This report summarizes recent work done in the area of longitudinal control of a platoon of autonomous vehicles. As a prerequisite to controller design, a twelve state nonlinear model including an internal combustion engine, engine transmission dynamics, and tire friction characteristics has been developed. Two simplified models for simulation and controller design are presented. After outlining the control problem, two platooning strategies, based on spacing or headway criterion, are proposed. To solve the control requirements, decentralized nonlinear control strategies using throttle...

San Joaquin Rail Corridor Crossing Survey

Greenhouse, Daniel
Christianson, Kent
Johnston, Scott
Kim, Zu
2008

In this project we have accomplished three goals. First, we have merged two existing, complementary databases in an effort to produce a single database that lists all the railroad crossings, and their known properties, in the San Joaquin Rail Corridor (SJRC). Second, we have demonstrated the practicality of using video data gathered from an existing Locomotive Video Data Acquistion System (LVDAS) to search for crossing violations in order to populate a database of crossing violations, which we term “near-misses”. By this means, crossings that are particularly susceptible to violations,...

An Evaluation Taxonomy For Congestion Pricing

Lo, H.
Hickman, M.
Walstad, M.
1996

This paper formulated an evaluation taxonomy to identify a broad range of factors that would be important for a comprehensive assessment. The evaluation taxonomy consists of three dimensions: road pricing strategies, impacted groups and impacts. We classified road pricing strategies by seven elements, and defined three types of impacted groups, and eleven impact types. Projects with different objectives will likely emphasize the impact types and impacted groups differently. This evaluation taxonomy is intended to be sufficiently broad so that a wide variety of road pricing schemes can be...

Shift Reference Manual

Deshpande, Akash
Gollu, Aleks
Semenzato, Luigi
1997

This document is a reference manual for SHIFT, a description language for dynamic networks of hybrid systems. This model offers the proper level of abstraction for describing complex applications such as highway and air traffic control systems, robotic shopfloors, and other systems whose operation cannot be captured by conventional models. SHIFT is planned for use as a mechanism for defining the Automated Highway System Tool Interchange Format (AHSTIF). An automated highway system is a hybrid system with specific characteristics and restrictions. SHIFT supports the definition and...

EasyConnect: Low-Speed Modes Linked to Transit Planning Project

Shaheen, Susan A. PhD
Rodier, Caroline J. PhD
2006

The EasyConnect Low-Speed Modes Linked to Transit Planning Project (TO 5113) project represents the integration of innovative strategies to enhance transit use during the development and construction of a suburban transit oriented development at the Pleasant Hill Bay Area Rapid Transit (BART) District station in the East San Francisco Bay Area. This planning project brings together a unique partnership including small technology businesses, transportation agencies, city and county government, and academia. The project components include the introduction of shared-use low speed mode...

Evaluation of TravInfo(tm) Field Operational Test: Final Report

Yim, Youngbin
Miller, Mark A.
2000

TravInfo TM is a regional traveler information system in the San Francisco Bay Area. It was a Field Operational Test (FOT) over a two-year period from September 1996 to September 1998 with funding from the Federal Highway Administration and the California Department of Transportation (Caltrans). The California PATH Program at the University of California, Berkeley conducted an evaluation of the field test.

Freight Transportation and Highway Automation: Research on Advanced Technologies for Goods Movement as an Integral Part of the PATH Program

Stevens, Ann D.
1987

The Program on Advanced Technology for the Highway (PATH), has been established in response to funding by the United States Congress and the California Legislature to demonstrate how "high technology" might be applied to improve highway transportation. PATH's goal, in the short run, is to implement technologies which promise significant relief of acute problemsincluding traffic congestion, air pollution and energy use. Alternative systems of vehicle guidance and control, navigation, propulsion, and communication will be studied and/or developed. The impacts of these systems on highway...

Transportation Modeling For The Environment: Final Report

Barth, Matthew
Norbeck, Joseph
1996

This report describes preliminary research dealing with vehicle emissions associated directly with Automated Highway Systems (AHS) and ramp metering. In performing this analysis, a power-demand model emissions model was integrated with several transportation simulation models in order to quantitatively determine the effects of Intelligent Transportation Systems (ITS) technology on vehicle emissions. For AHS, a steady-state speed/emissions comparison was conducted between vehicles that are platooned and non-platooned. For ramp metering, a general evaluation was conducted concentrating on...

Fault Tolerant Autonomous Lateral Control for Heavy Vehicles

Talbot, Craig Matthew
Papadimitriou, Iakovos
Tomizuka, Masayoshi
2004

This report summarizes the research results of TO4233, "Fault Tolerant Autonomous Lateral Control for Heavy Vehicles". This project represents a continuing effort of PATH's research on Automated Highway Systems (AHS) and more specifically in the area of heavy vehicles. Research on the lateral control of heavy vehicles for AHS has been going on at PATH since 1993. MOU129, "Steering and Braking Control of Heavy Duty Vehicles" was the first project and it was followed by MOU242, "Lateral Control of Commercial Heavy Duty Vehicle". Both projects were concerned mostly with the theoretical...