PATH

Fuel Saving Achieved in the Field Test of Two Tandem Trucks

Browand, Fred
McArthur, John
Radovich, Charles
2004

The fuel consumption of two tandem trucks is recorded for truck spacings of 3, 4, 6, 8, and 10 meters. The trucks are linked by means of an electronic control system, and are operated on an unused runway at Crows Landing, California. Fuel consumption data is averaged while traveling in both directions over the same central strip of runway to cancel the effect of runway slope and to partially cancel the effect of wind. The average fuel consumption saving to be achieved by tandem operation varies from about 11% at 3-4 meters spacing to about 8% at 8-10 meters spacing.

Vehicle Lane Change Maneuver In Automated Highway Systems

Chee, Wonshik
Tomizuka, Masayoshi
1994

In this report, lane change maneuver for an automated highway system is investigated as a tracking problem with respect to the virtual desired trajectory (VDT). The two main issues discussed in the report are: 1) design of virtual desired trajectory and 2) design of control algorithms. Four types of desired trajectories are considered. The use of onboard sensors for closed loop control are used. Three closed loop controllers, based on 1) linear quadratic (LC) optimal control, 2) frequency shaped linear quadratic (FSLQ), and 3) sliding mode control are evaluated. Simulation results show...

Personalized Demand-Responsive Transit Service

Cayford, Randall
Yim, Y. B. Youngbin
2004

Providing easy access to the public transit service is the goal of the California transit agencies. Many travelers cannot take an express transit because they often cannot park and ride. Smart DRT (demand responsive transit) Feeder is a system that collects transit riders from neighborhoods and takes them to transit stations. This system will use APTS (Advanced Public Transit System) technologies to make the feeder service convenient and reliable. The concept is very simple. When demand is high, Smart Feeder will use the fixed-route fixedschedule service. When demand is low, it will use...

Mobile Traffic Management System Test Deployment

Gerfen, Jeffrey Brian
2005

The Mobile TMC and various field elements were developed for Caltrans Division of Research and Innovation (DRI) between 1994 and 2002. These systems were all designed to operate independent of one another to provide on-site traffic data collection, video surveillance, and traffic management functions to support Caltrans TMC operations. Cal Poly researchers integrated these systems and an off-the-shelf changeable message sign into a Mobile Transportation Management System (MTMS). This new and integrated system is capable of operation untethered from a fixed-site Transportation Management...

Traffic Surveillance And Detection Technology Development: New Traffic Sensor Technology Final Report

Malik, Jitendra
Russell, Stuart
1997

This document presents the final report on a project focusing on new traffic sensor technology, mainly video cameras, for traffic surveillance and detection. It describes a Transportation Management Center (TMC), designed for the collation and computation of multi-site statistics. The report discusses the following elements: tracking approach, motion-based grouping, tracking and grouping procedures, vehicle classification, hardware port, parameters computed at the TMC, testing methodology, and test results.

Collision Analysis Of Vehicle Following Operations By Two-dimensional Simulation Model: Part I - Effects Of Operational Variables

Chan, Ching-Yao
1997

This research project investigates the behaviors of vehicles in collisions, especially when they are closely spaced. The study uses a two- dimensional simulation program, EDSMAC, which allows longitudinal and lateral movements as well as the yaw motion of vehicles. The simulation model calculates impact forces in collisions and estimates the resulting vehicle damage. Collision situations are simulated. The subsequent post- impact vehicle trajectories are then analyzed. By varying parameters in simulation cases, one can evaluate the potential effects of such variables in vehicle-following...

Development of Binocular Stereopsis for Vehicle Lateral Control, Longitudinal Control and Obstacle Detection

Malik, Jitendra
Kosecka, Jana
Taylor, Camillo J.
McLauchlan, Philip
1999

This nal report describes the application of computer vision techniques to the lateral and longitudinal control of an autonomous highway vehicle. In the part of the project we focused on an analysis of the vehicle's lateral dynamics and the design of an appropriate controller for lateral control and investigated various static feedback strategies where the measurements obtained from vision, namely o set from the centerline and angle between the road tangent and the orientation of the vehicle at some look-ahead distance, are directly used for control. The role of the look-ahead, its...

Design And Implementation Of Digital Radio Communications Link For Platoon Control

Li, Wei-yi
1995

This report discusses the design and implementation of inter-vehicle communication systems used in the longitudinal control platoon experiments conducted by PATH (Partners for Advanced Transit and Highways). In the first section of the report, the inter-vehicle communication links implemented in both the two and four vehicles platoon experiments are examined. Lastly, this report investigates some possible future improvements of the communication link used for platoon control experimentation.

Task A-2: Implementation and Management of Electronic Roadway Tolling: Lessons from Successful Cases

Kalauskas, Rebecca
Taylor, Brian D.
Iseki, Hiroyuki
2009

Over the past decade road pricing has moved from the drawing board to practice in projects large and small around the world. But while interest in and experience with electronic roadway tolling is on the rise, political acceptance is not yet widespread and standard models of implementation and management have yet to evolve. Accordingly, this report examines a variety of road pricing projects– some that were smoothly implemented, and others that encountered significant obstacles along the way. Based on these cases and a thorough review of the literature, we draw lessons to guide future...

A Combined Traveler Behavior And System Performance Model With ATIS

Khattak, Asad
Al-deek, Haitham
Thananjeyan, Paramsothy
1994

The specific objective of this study is to assess traveler behavior impacts of Advanced Traveler Information Systems (ATIS) technologies and the consequent system impacts at highway bottlenecks caused by incidents and recurring congestion. This research is based on earlier work regarding impacts of congestion on traveler behavior and system performance in the presence of information. In this paper, the authors enhance the previous work and develop a richer and more comprehensive approach for evaluating ATIS technologies. The unique features of this study are: 1) integration of traveler...