Intelligent Transportation Systems

Integrated Traffic and Communications Modeling Environment for ATMIS

Varaiya, P.
Walrand, J.
Wu, F.F.
Polydoros, A.
Sylvester, J.
1997

The aims of this MOU were to create an integrated environment for modeling traffic flow, sensor data, and the communications infrastructure for ATMIS. The research plan was to build separate tools for measuring the communications requirements of ATMIS traffic, modeling a mobile radio communications environment, and communications network design, and then to integrate them in an object-oriented environment from which one could also access existing or new road traffic simulation packages.Section 1 of the report presents a framework for estimating the vehicle-roadside communications...

PATH ITS Research Digests

Chira-Chavala, Ted
2001

Ramp meters are commonly used to relieve congestion on freeways. What is the value of these systems? Ramp metering can alleviate recurrent, regular traffic congestion, such as that caused by the daily commute. The goal is usually to maintain uninterrupted freeway flow at a certain acceptable level, but it transfers delay to the entrance ramp, where excess demand is forced to wait. This report summarizes ramp metering technologies, reviews the algorithms commonly used with them, and uses a traffic simulation model to identify the benefits and costs of using these systems. We used a...

Evaluation of Potential ITS Strategies Under Non-Recurrent Congestion Using Microscopic Simulation

Chu, Lianyu
Liu, Henry X.
Recker, Will
Hague, Steve
2003

This report presents a micro-simulation method to evaluate potential ITS applications. Based on the commercial PARAMICS model, a capability-enhanced PARAMICS simulation environment has been developed through integrating a number of plug- in modules implemented with Application Programming Interfaces (API). This enhanced PARAMICS simulation can thus have capabilities to model not only the target traffic conditions and operations but also various potential ITS strategies. An evaluation study on the effectiveness of potential ITS strategies under the incident scenarios is conducted over a...

Steady State Conditions on Automated Highways

del Castillo, Jose M.
Lovell, David J.
Daganzo, Carlos F.
1995

This paper is concerned with technical investigations of traffic operations on automated highways. Estimates are made of the steady-state capacity of such freeways, paying particular attention to the effect of entry and exit maneuvers. The possibility of scheduling departing vehicles appropriately into platoons to minimize extraneous maneuvers is investigated. Characteristics of urban areas likely to be candidates for automated freeways are discussed, and some shortcomings of automated freeways, vis-à-vis conventional freeways, are pointed out. Finally, some areas of future research needs...

Experimental Studies on High Speed Vehicle Steering Control with Magnetic Marker Referencing System

Tan, Han-Shue
Bougler, Bndicte
2000

This project is a one-and-half year research and experimental effort that builds on the results of as well as supplements the efforts in MOU 250, "Experimental Studies on Vehicle Control Systems." It focuses on an emerging issue of the high-speed steering control: how to conduct robust automatic vehicle steering control at highway speed based on a look-down lateral sensing system.

Summary of Selected, Significant ITS and ITS-related Policies and Programs in Europe and the US (with Japan Supplement)

Conroy, Pat
Ygnace, Jean-Luc
2002

This research project explored institutional and organizational factors contributing to successful deployment of Intelligent Transportation Systems (ITS). The researchers conducted a comprehensive internet/literature search on the status of ITS programs in Europe and the U.S., interviewed principals involved in ITS deployment both at the policy and project levels, and from the public and private sectors, and developed four case studies of successful ITS deployment. Results from the internet/literature search and responses from the survey/interviews were analyzed to identify critical...

Decision Support Systems for Managing and Applying ITS Resarch

Dahlgren, Joy
Al Kadri, Mohamed
Picado, Rosella
1998

This study is presented in three related papers. The first develops a structurefor making decisions regarding Caltrans/PATH research. It describes aresearch cycle in which real world needs and opportunities fed into a processby which research priorities are set, proposals invited, and projects areselected. These research projects ultimately provide information that can beused for further research or for implementation. Implementation changessociety and technology and leads to new needs and opportunities, which inturn feed into the research process. The second paper develops and...

Users’ Guide and Design Description SmartPath Simulator - Version MOU62

Hongola, Bruce
Tsao, Jacob
Hall, Randolph
1993

This document contains the user instructions and software design description for Version MOU62 of the SmartPath Simulator. The baseline version of the simulator including user instructions is described in [l].

TMDD Standards Update Recommendations – Data and System Security

Peterson, Brian
2022

This document provides recommendations for modifications to the current TMDD standard. Its goal is to provide a foundation for modernizing the standard. This document specifically provides recommendations for implementing this project’s gap analysis recommendations related to providing security guidance for each approved transmission protocol. Included in this document are recommendations related to a new volume of the specification dealing with minimum security requirements and security recommendations for each data transmission protocol.

A Time Headway Autonomous Intelligent Cruise Controller: Design and Simulation

Ioannou, P.A.
Ahmed-Zaid, F.
Wuh, D.H.
1994

Autonomous Intelligent Cruise Control (AICC) design is an important part of Advanced Vehicle Control Systems (AVCS). In this report, we design an AICC scheme for vehicle following with constant time headway spacing. The scheme maintains a steadystate inter-vehicle spacing decided by a desired time headway set by the driver. The longitudinal model of the Lincoln Town Car is used for simulations and testing. The vehicle is assumed to be equipped with a relative distance and speed measuring sensor,as well as an absolute speed measuring device.