PATH

An Efficient Lane Change Maneuver for Platoons of Vehicles in an Automated Highway System

Horowitz, Roberto
Tan, Chin-Woo
Sun, Xiaotian
2004

The current lane change maneuver for vehicles in a platoon under the California PATH automated highway system (AHS) architecture is inefficient, because the follower has to split from the rest of the platoon before making a lane change. In this report, we propose to add a lane change within platoons maneuver that allows a follower to change lanes and be inserted into another platoon directly without splitting either platoon. This maneuver is performed by aligning and locking the longitudinal positions of the two platoons in adjacent lanes. The estimated improvement in the AHS utilization,...

Final Report: Mobile Surveillance and Wireless Communication Systems Field Operational Test; Volume 1: Executive Summary

Klein, Lawrence
1999

The Mobile Surveillance and Wireless Communication Systems Field Operational Test (FOT) evaluated the performance of wireless traffic detection and communications systems in areas where permanent detectors, electrical power, and landline communications were not available. The FOT partners designed and built six surveillance and three ramp meter trailers, a video and data retransmission or relay site, and video and data reception facilities at the Caltrans District 12 and Anaheim Traffic Management Center (TMCs) and the University of California at Irvine Institute of Transportation Studies...

Experimental Verification of Discretely Variable Compression Braking Control for Heavy Duty Vehicles: Final Report

Vahidi, Ardalan
Stefanopoulou, Anna G.
Wang, Xiaoyong
Tsao, Tsu Chin
2004

In the first two chapters of this report, the development of discrete compression brake and transmission models is explained. In the vehicle model development, special efforts have been put in transmission shifting scheduling. Transmission up-shift and down-shift scheduling are separated in the modelling. Hysteresis during shifting is introduced to reduce chattering. A compression brake effect on transmission shifting is identified and considered in the modelling. The new transmission shifting model has been validated through experimental data. The transmission shifting model is combined...

Assessing the Benefits and Costs of Intelligent Tranportation Systems: Ramp Meters

Kang, Seungmin
Gillen, David
1999

This study undertakes an evaluation of the benefits and costs of ramp metering. The primary purpose was to provide empirical information on the value of the introduction and use of this form of ITS technology. Three cases are examined in the analysis. The impact of ramp metering on traffic behavior is simulated based on a cell transmission model and an assumed travel demand on the freeway as well as the ramp. Temporal travel demand change is determined based on the average travel pattern obtained from the I-880 freeway database. Isolated, single traffic responsive ramp metering is assumed...

Study of Integrated Corridor Management for San Francisco Bay Area I-880 Corridor

Zhang, Wei-Bin
Li, Irene
Shladover, Steven
Li, Meng
Alm, Erik
Ban, Jeff
Victor, Radiah
Yee, Albert
Stanislaus, Danielle
Chow, Alan
Nozzari, Sean
Minoofar, Cyrus
Yarjani, Bijan
Spencer, Tina
Broadbent, Patricia
Alexiadis, Vassili
Hatata, Tarek
Nejad, Anush
Shamskhou, Habib
2008

This document summarizes the efforts by the San Francisco Bay Area ICM team to develop the concept of operation, data needs and performance requirements for an Integrated Corridor management System for I-880 Corridor. Although the transportation management systems at the Bay Area are consistent with the regional ITS plans, these management systems are less integrated. It is believed that higher lebel of intergration among freeway and arterial systems, transit systems with consideration of all transportation needs demands in the region will greatly enhance and improve the efficiency and...

State-of-Health Estimation Pipeline for Li-ion Battery Packs with Heterogeneous Cells

Gill, Preet
Zhang, Dong
Couto, Luis D.
Dangwal, Chitra
Benjamin, Sebastien
Zeng, Wente
Moura, Scott
2022

The internal condition of lithium-ion batteries, in particular State-of-Health (SoH), needs careful monitoring to ensure safe and efficient operation. In this paper, we propose a hybrid online SoH estimation pipeline for series-connected heterogeneous cells. Implementing a single cell parameter estimation scheme for a battery pack with hundreds to thousands of cells is computationally intractable. This challenge is solved in this work using feature-based adaptive polling of cells with "extreme" parameter values. Furthermore, the electrical parameters for the polled cells are estimated...

Spatial and Temporal Factors in Estimating the Potential of Ride-Sharing for Demand Reduction

Tsao, H.-S. Jacob
Lin, Da-Jie
1997

This study reports on a method to accomplish sensor validation and fusion in Intelligent Transportation Systems (ITS). The method is based on probabilistic and fuzzy techniques that express a confidence in the sensor data and take into account environmental factors and the state of the system. Sensor data fusion uses the confidence assigned to each sensor reading and integrates them into one reading. Noise and failure are filtered from the data and lead to a safety improvement in ITS.

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...

Sketch of an IVHS Systems Architecture

Varaiya, P. P.
Shladover, Steven E.
1991

Presents a sketch of a system architecture for the control and management tasks of an intelligent vehicle/highway system (IVHS)

Simulation of IVHS on the Smart Corridor Using the Integration Model: Phase 1: Initial Investigations

Gardes, Yonnel
May, Adolf D.
1993

The general objective of this project is to evaluate the potential benefits of Advanced Traveler Information Systems and Advanced Traffic Management Systems on the Smart Corridor. This report describes Phase 1 of the project in which the INTEGRATION traffic simulation model is used to help simulate ATIS and ATMS on a freeway/arterial environment.