PATH

TravInfo Evaluation: Traveler Response Element; TravInfo 817-1717 Caller Study; Phase 2 Results

Koo, Ronald
Yim, Y. B.
2001

TravInfo was a federally funded Field Operational Test (FOT) of the Advanced Traveler Information System (ATIS) in the San Francisco Bay Area. The general public can obtain most current traveler information through TravInfo's Traveler Advisory Telephone System (TATS) and privately offered information services including traffic Web sites. As part of the TravInfo FOT Evaluation, two waves of TATS callers were surveyed. The first wave of the TATS caller survey was conducted in April 1997. The second wave TATS caller survey was completed in April 1999. This paper presents the findings of the...

A Comparable Systems Analysis Of San Francisco's BART: Lessons For Automated Highway Systems

Hickman, Mark D.
1994

This study examines the lessons to be learned from the experience of the San Francisco Bay Area Rapid Transit (BART) system, particularly as applied to the growing research on automated highway systems (AHS). The first section of the report briefly motivates the analogy of BART by comparing some of the technical and non-technical performance factors surrounding both AHS and BART. Several pertinent technical and non- technical issues surrounding BART are described in more detail, emphasizing the decision-making that went in to BART's development, testing, and the beginning of revenue...

Consumer Research on Advanced Traveler Information Systems: TravInfo Field Operational Test

Yim, Youngbin
1997

The paper describes the evaluation framework of the TravInfo project, a field operational test of the San Francisco Bay Area advanced traveler information system. The purpose of the evaluation study is to measure changes in individual travel patterns that result from the TravInfo project and to assess traveler acceptance of and preference for advanced traveler information technology. The anticipated effects of TravInfo on Bay Area travelers were described using some of the economic concepts of supply and demand relationships between information providers and information users. Consumer...

A Network Layer for Intelligent Vehicle Highway Systems

Eskafi, Farokh
Zandonadi, Marco
1999

The objective of this paper is to design the network layer of a communication stack to be used in Automated Highway Systems (AHS). The communication model we propose allows cars to form private subnets, the configuration of which can change dynamically. Each car be part of multiple subnets and can send broadcast, multicast and point-to-point messages to other vehicles (both on the same subnet and on others, through a routing mechanism). Each subnet is managed by a server: a car that is in charge of accepting/rejecting join requests and of keeping a consistent state within the subnet....

The Design of a Controller for a Following Vehicle in an Emergency Lane Change Maneuver

Swaroop, D.
Yoon, Seok Min
1999

A lane change maneuver is one of the many appropriate responses to an emergency situation. The design of an Emergency Lane Change (ELC) maneu- ver for a platoon of two vehicles is considered in this paper. In response to the presence of a stationary or a slowly moving obstacle in the lane or any such emergency, the lead vehicle in the platoon designs an ELC trajectory on-line and broadcasts the trajectory curvature information in real time to its follower. The problem considered, in this paper, is the design of an integrated lateral and longitudinal controller that enables the follower to...

Freeway Performance Measurement System, PeMS v3, Phase 1: Final Report

Varaiya, Pravin
2001

PeMS is a freeway performance measurement system for all of California.  It processes 2 GB/day of 30-second loop detector data in real time to produce useful information. Managers at any time can have a uniform, and comprehensive assessment of freeway performance.  Traffic engineers can base their operational decisions on knowledge of the current state of the freeway network.  Planners can determine whether congestion bottlenecks can be alleviated by improving operations or by minor capital improvements.  Travelers can obtain the current shortest route...

Safety Aspects of Freeway Weaving Sections

Golob, Thomas F.
Recker, Wilfred W.
Alvarez, Veronica M.
2003

One source of vehicle conflict is the freeway weaving section, where a merge and diverge in close proximity require vehicles either entering or exiting the freeway to execute one or more lane changes. Using accident data for a portion of Southern California, we examined accidents that occurred on three types of weaving sections defined in traffic engineering: Type A, where every merging or diverging vehicle must execute one lane change, Type B, where either merging or diverging can be done without changing lanes, and Type C, where one maneuver requires at least two lane changes. We found...

Evaluating the Impact of ITS on Personalized Public Transit

Dessouky, Maged M.
Hall, Randolf 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...

Evaluating the Impact of ITS on Personalized Public Transit

Dessouky, Maged M.
Aldaihani, Majid
Shah, Rutvij
2002

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 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 report is a statistical analysis of travel patterns of a paratransit provider in Los...

The Effects of Data Inaccuracy on the Performance of Traffic Signal Timing Plans

Lin, Wei-Hua
Liao, Lawrence C.
1998

This paper explores the performance of signal timing plans calibrated with perfect or imperfect information. The arrival information considered include arrival rates and arrival distributions. The study is conducted for different levels of arrival rates and different forms of arrival distributions under a wide range of arrival information inaccuracy, traffic intensity, and intersections with balanced and unbalanced flows.Our results indicate that the increase in delay, the number of stops, and queue length is in general insignificant when the arrival distribution used to calibrate the...