PATH

Lane Assist Systems for Bus Rapid Transit, Volume III: Interface Requirements

Bu, Fanping
Zhang, Wei-Bin
Dickey, Susan
Shladover, Steven E.
Tan, Han-Shue
2007

Vehicle Assist and Automation (VAA) systems enable lane assist, precision docking and longitudinal control of transit vehicles. They offer the opportunities of providing high quality transit service within reduced lane widths. Transit vehicles in North America are mostly manufactured based on individual transit agencies’ customized requirements. The interfaces between VAA components and the mechanical, electrical and electronic systems on the existing transit vehicle, if not defined properly, can be an impediment to large scale deployment of VAA technologies. This report summarizes a...

Field Investigation of Advanced Vehicle Reidentification Techniques and Detector Technologies - Phase 2

Ritchie, Steven
Park, Seri
Oh, Cheol
Jeng, Shin-Ting
Tok, Andre
2005

This report presents the results of Phase 2 of a multi-year research effort on "Field Investigation of Advanced Vehicle Reidentification Techniques and Detector Technologies." Phase I of this research was conducted under PATH MOU 3008. Phases I and II of this research extended previous PATH research by the authors on MOU 336 "Section-Related Measures of Traffic System Performance: Prototype Field Implementation." Phase II of this research continued development, field investigation and assessment of the latest technologies available for traffic detection and surveillance, for collecting...

Optimal Preview Control For Vehicle Lateral Guidance

Peng, Huei
Tomizuka, Masayoshi
1991

This report introduces an optimal preview control algorithm which utilizes preview information pertaining to road curvature as well as superelevation angle for vehicle lateral control purposes. The optimal control law consists of both feedback control action and feedforward preview control action. The feedforward preview control action significantly improves tracking performance while maintaining a small closed loop bandwidth so ride quality is not impaired. Frequency domain analyses and numerical simulation results show improvements obtained in both frequency domain and time domain

Spacing And Capacity Evaluations For Different Ahs Concepts

Kanaris, Alexander
Ioannou, Petros
Ho, Fu-sheng
1996

In this study, the authors consider a family of six Automated Highway Systems (AHS) operational concepts. For each concept, the minimum inter- vehicle spacing that could be used for collision-free vehicle following, under different road conditions, is calculated. For architectures involving platoons, the authors also use the alternative constraint of bounded energy collisions to calculate the spacing that can be applied if collisions at a limited relative velocity were allowed. In every case, the minimum spacing in turn, is used to calculate the maximum possible capacity that could be...

Development and Field Testing of Laser Photodiode Array-Based Vehicle Detection Systems

Cheng, Harry H.
Shaw, Ben
Palen, Joe
Wang, Zhaoqing
Feng, Ping
Nestinger, Stephen
Chen, Bo
2004

Over the past year we have researched the development of a network-based real-time laser-based nonintrusive field-deployable detection for the delineation of moving vehicles. The primary goal of this project is to develop a roadway detection system that can be used to gather reliable travel time data non-intrusively. A powerful Rabbit 3200, instead of multi-microchips, is used to control digitally controlled potentiometers (DCP), which adjust the gain of the sensors' signals. Utilizing digitally controlled potentiometers allow for quick and easy adjustment on the highway with only the need...

Developing Calibration Tools for Microscopic Traffic Simulation Final Report Part 1: Overview Methods and Guidelines on Project Scoping and Data Collection

Zhang, Michael
Ma, Jingtao
1998

The purpose of MOU-233 is to evaluate and test a low cost, short range radar sensor developed by Amerigon corporation through a subcontract with the University of Southern California. The radar is designed to be used as a ranging sensor for automatic vehicle following applications. It is intended to be mounted in the front of the vehicle and provide measurements of the distance between the front of the vehicle and the rear of any vehicle or object ahead within a maximum distance of 17 feet. The output of the radar as supplied by Amerigon, is a 32-bit binary code, using one bit to represent...

Field Test Of Vehicle-mounted, Forward Looking Range Sensor In Closed-loop Avcs

Kanaris, Alex
Ioannou, Petros
1998

The purpose of MOU-233 is to evaluate and test a low cost, short range radar sensor developed by Amerigon corporation through a subcontract with the University of Southern California. The radar is designed to be used as a ranging sensor for automatic vehicle following applications. It is intended to be mounted in the front of the vehicle and provide measurements of the distance between the front of the vehicle and the rear of any vehicle or object ahead within a maximum distance of 17 feet. The output of the radar as supplied by Amerigon, is a 32-bit binary code, using one bit to represent...

Dynamic Modeling and Simulation of Snowplow: Normal Operation and Icepack Impacts

Shou, Kun
Tomizuka, Masayoshi
Zhang, Wei-Bin
2000

Keywords: Dynamic Modeling, Snowplows, Multi-Unit Vehicles, Icepack Impacts, Braking Control, Steering Control.

Opportunities And Constraints For Advanced Highway Technologies: A Speculative Analysis

Deakin, Elizabeth
1989

Might the performance of transportation systems be significantly improved through greater application of emerging technologies? Recent advances in computers, materials, communications, control systems, information systems, and many other areas raise intriguing possibilities.

Evaluation of Cost-Effective Planning and Design Options for Bus Rapid Transit in Dedicated Bus Lanes

Li, Jing-Quan
Song, Myoung Kyun
Li, Meng
Zhang, Wei-Bin
Miller, Mark
2009

Bus Rapid Transit (BRT) systems with dedicated lanes have shown advantages over traditional bus systems and have attracted more transit riders. However, it is not always possible to build BRT systems with two dedicated lanes due to physical and cost constraints. A BRT system with a single dedicated lane is more practical and desirable in such situations. In a single lane configuration, buses approaching from opposite directions share the same road section and can overtake or pass each other only at the bus stops. We propose an optimization model to describe the synchronization requirements...