PATH

The Mass Transit Needs Of A Non-driving Disabled Population

Golledge, Reginald G.
Costanzo, C. Michael
Marston, James R.
1996

This paper examines further characteristics of the activity patterns of blind and vision impaired non-driving populations previously discussed in PATH Database Reference No. The report begins with an exploration of the activity patterns of blind or vision impaired people, followed by an evaluation of the impact of non-driving on employability and movement potential of the disabled non-driving group. The results of a survey of blind and vision impaired users of public transit facilities are then examined. Travel behavior characteristics and travel modes are studied. Possible assistive...

Monitoring The San Francisco Bay Area Freeway Network Using Probe Vehicles And Random Access Radio Channel

Linnartz, Jean-paul M. G.
Westerman, Marcel
Hamerslag, Rudi
1994

In this report, the authors describe a method of collecting real-time traffic data from probe vehicles automatically sending traffic reports to one or m ore base stations, connected to a traffic center by a wired communications network. Analyzing and computing road traffic and message traffic flows in the San Francisco Bay Area, the authors study several multi-disciplinary aspects of this data collection technique. The results presented in this report reveal that random access (ALOHA) transmission of traffic messages is a (spectrum) efficient, inexpensive and flexible method for collecting...

Development and Assessment of Selected Mobility Applications for VII: Principal Findings

Shladover, Steven E
Lu, Xiao-Yun
Nowakowski, Christopher
2011

This project has shown how connected vehicle systems, based on vehicle-vehicle and vehicle-infrastructure communication and coordination, can support the development of mobility-enhancing applications with the potential to transform the performance of the road transportation system. Three separate mobility-enhancing applications were developed, simulated, and tested, and their expected mobility benefits were estimated using simulations. Cooperative adaptive cruise control was shown to have a high potential for user acceptance, and when applied at the gap settings chosen by representative...

Assessing the Value of TMCs and Methods to Evaluate the Long Term Effects of ITS: Measuring Congestion, Productivity and Benefi t Flow from Implementation

Gillen, David
Cooper, Douglas
2004

The study carries out an evaluation of TMCs (traffic management centers) using three methodologies; case studies, performance based regressions and time series analysis. The study is an extension of previous work that assessed the contribution of different types of intelligent transportation investments and initiatives. However, this research sought to distinguish the separate contributions of the ITS investments from the synergies of integration under a traffic management center. Secondly, the research investigated the time dimension of benefits where we investigated if there was an 'S'...

Nonlinear Longitudinal Controller Development and Real-time Implementation

Lu, Xiao-Yun
Tan, Han-Shue
Empey, Dan
Shladover, Steven E.
Hedrick, J. Karl
2000

Keywords longitudinal control, car platooning, back-stepping control, multi-surface dynamic sliding mode control, integral filters, realtime control code This report presents the development of nonlinear longitudinal controllers and their realtime implementation for Automated Highway Systems (AHS) at PATH, U. C. Berkeley supported by the project MOU 331. The demo'97 realtime code was first reconstructed for further development. Based on the new framework, the implementation and comparison of nonlinear controllers in the longitudinal control for cars platooning and other maneuvers have been...

Fmcw Mmw Radar For Automotive Longitudinal Control

David, William
1997

This report presents information on millimeter wave (MMW) radar for automotive longitudinal control. It addresses the fundamental capabilities and limitations of millimeter waves for ranging and contrasts their operation with that of conventional microwave radar. The report analyzes pulsed and FMCW radar configurations, and provides detailed treatment of FMCW radar operating at MMW frequency, its advantages and disadvantages as they relate to range and velocity measurements.

Commercial Motor Vehicle Inspection and Screening Stations: Evaluating Performance from the Perspective of Practitioners

Miller, Mark A.
Garefalakis, Antonios
2009

This report presents the findings of a study of commercial motor vehicle inspection and screening station practices with a focus on the use of various technologies to help address problems related to safety, security, roadway infrastructure, and air quality. A review of industry literature identified the various types of inspection and screening practices that have been and are being implemented including weight and size management, on-board equipment checking, driver-related violations and cargo monitoring, credential checking, and exhaust emissions monitoring. The review also identified...

Transit Service Integration Practices: An Assessment of U.S. Experiences

Miller, Mark A.
Englisher, Larry S.
Halvorsen, Rick
Kaplan, Bruce
2005

This report presents the results of its assessment of transit service integration practices in the United States. Initially, a review of the literature was performed that identified the various types of service integration policies that have been and are being implemented including infrastructure, schedule, information, fare payment and special events/emergency service integration. The review also revealed how the introduction of service integration practices is part of overall changes in transit properties' way of conducting business. The research then made use of a twostage survey of...

SPRINTER Rail: Grade Crossing/ Traffic Signal Optimization Study

Wu, Guoyuan
Li, Irene
Zhang, Wei-Bin
Johnston, Scott
Li, Meng
Zhou, Kun
2009

The second phase of this project further investigates impacts to local traffic operations at intersections adjacent to signal preemption by SPRINTER commuter trains and comes up with countermeasures that not only minimize such impacts but also take into account the traffic signal coordination. An extended traffic signal optimization model has been developed to minimize overall traffic delays and the weighted width of “green band” along several coordinated traffic signals around the grade crossings. Based on the train’s movement detection at grade crossings and the waiting queue estimation...

Smart Cards, Slow Deployment: Findings from Interviews with U.S. Transit Agencies

Iseki, Hiroyuki
Taylor, Brian D.
Yoh, Allison
2008

This report summarizes findings from interviews with transit officials at seven agencies in North America about smart card evaluations, expectations, and implementation. As part of the project, “Designing a Policy Framework for a Statewide Transit Smart Card System,” this report was preceded by a literature review of smart card projects and an online survey of transit agencies’ knowledge of and interest in interoperable smart card systems for fare collection. The literature review found a lot of booster-like enthusiasm for smart cards, but few studies that have rigorously evaluated smart...