Intelligent Transportation Systems

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.

California System Architecture For Intelligent Transportation: Models For Transportation Systems Management

Hall, Randolph
Thakker, Viral
1998

In 1996, the Federal Highway Administration completed a program to develop a national system architecture (NSA) for intelligent-transportation-systems. This report presents recommendations on methodologies by which system architecture can be used to improve the deployment of transportation management projects, with emphasis on multi-jurisdictional projects. The report is part of a larger project addressing the deployment of an ITS system architecture in California. The project as a whole is led by Claremont Graduate School, and is documented in a separate report.

Effects of Traffic Density on Communication Requirements for Cooperative Intersection Collision Avoidance Systems (CICAS)

Shladover, Steven E.
2005

Intersection collisions are difficult to mitigate or eliminate by use of ITS technologies for a variety of reasons. These include the complexity of the driving environment and of the driver decision making process at intersections, but also the difficulty of accurately detecting the movements of all potentially conflicting vehicles. Prior research by Calspan-Veridian Engineering (now part of General Dynamics) (1) showed the near impossibility of detecting the relevant information using vehicle-mounted sensor systems. Current research under the IDS program is revealing the challenges...

Some Aspects of the Market for Broadcast Traffic Information

Malchow, Matthew
Kanafani, Adib
1999

In recent years, planners have looked toward traffic information systems as an immediate solution to the congestion on U.S. highways. ITS systems are low-cost relative to many alternatives, and simple implementation allows for quick results. Alongside these investments has been research investigating the use of information systems by drivers and the results to be expected. Many studies have shown that the primary source of information for drivers has been broadcast systems such as the radio (e.g. Yim et al., 1997). Additional research has addressed other media which are used to transmit...

Studies of Vehicle Collisions - A Documentation of the Simulation Codes: SMAC (Simulation Model of Automobile Collisions) [ Diskette Included ]

Chan, Ching-Yao
1998

This document describes part of the work conducted under MOU252 and MOU324, related to the studies of vehicle collisions in vehicle-following operations. This working paper is a detailed documentation of a computer program that is the core element of the simulation tools for vehicle collision dynamics. The program, SMAC (Simulation Model of Automobile Collisions), and its PC-platform version EDSMAC have been used extensively in recent work at PATH to investigate the consequences of vehicle collisions and the effects of vehicle-following parameters on collisions. A copy of the source codes...

Paramics API Development Document for Actuated Signal, Signal Coordination and Ramp Control

Liu, Henry X.
Chu, Lianyu
Recker, Will
2001

Paramics is a suite of high performance software tools used to model the movement and behavior of individual vehicles on urban and highway road networks. The Paramics Project Suite consists of Modeller, Processor, Analyzer, and Programmer. Paramics Programmer is a framework that allows the user to customize many features of underlying simulation model. Access is provided through a Functional Interface or Application Programming Interface (API). The capability to access and modify the underlying simulation model through API is essential for research. Such an API should have a dual role,...

Video-Based Vehicle Signature Analysis and Tracking Phase 1: Verification of Concept Preliminary Testing

MacCarley, Arthur C.
1998

This report describes the results of the PATH/Caltrans-funded project Video-Base Signature Analysis and Tracking (VSAT) System, Phase 1: Verification of Concept and Preliminary Testing. The VSAT System was conceived in 1995 by Loragen Systems, of Glendale, California, as a means for non-intrusively tracking individual vehicles on freeways for data collection purposes. The concept involves the use of a computer vision methods to make simple measurements of external dimensions, points of optical demarcation, and predominant colors of each vehicle. A conventional color video camera serves as...

Investigating Institutional Aspects of Multi-Agency Transit Operations-Review of the Literature

Lam, Amy
Miller, Mark A.
2002

Transit systems have traditionally been developed independently from one another,certainly across different regional jurisdictional boundaries,however,even within the same regional jurisdictional boundary where the ramifications of this are most significantly felt.Little attention has been given to coordination,integration,or interoperability between and among systems.As a result,customer satisfaction,market share and public transit relevance has continued to decline. This report,which presents the findings from our literature review of the topic of multi-agency transit operations,...

Ultrasonic Ranging Control Board Documentation

Chen, Jennie
Foreman, Bret
Mostov, Kirill
1994

This document specifies the theory of operation of version B of the PATH ultrasonic range control board for the IBM PC. Two modes are discussed in detail. The first is the ping mode, which uses a single transducer both to send an ultrasonic pulse and receive its echo. The second, called the phased-array mode, uses a single transducer to send the pulse and two other transducers to receive echoes and perform path-length matching in order to reduce the effects of multi-path echoes. Both the hardware and the software used to perform these functions are examined.