Infrastructure

Communication Requirements and Network Design for IVHS

Hsu, Ivy Pei-Shan
Walrand, Jean
1993

This paper presents the communication needs between vehicles and the roadside infrastructure for IVHS applications. The requirements of each application, in terms of message length, frequency, and acceptable delay, are estimated. Based on these estimates, we assess the amount of radio spectrum needed to support these applications. We find that about 1.2 MHz is required to support full highway coverage. We discuss the topology and capacity allocation problems for the road-based network and present one possible implementation. We show a case study of network design and link capacity...

Single-channel IVHS Communication Architecture

Linnartz, Jean-paul M. G.
1994

This report documents a single-channel architecture offering two-way communication between vehicles and a fixed communication infrastructure. Part I discusses the technical advantages and disadvantages of a dedicated Intelligent Vehicle Highway Systems (IVHS) communications infrastructure versus the use of a hybrid system involving several existing communication networks. Aspects such as spectrum efficiency, message capacity, and network performance are described. Part II proposes a network architecture that offers several transmission services essential to IVHS communications, using only...

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.

Spectrum Needs For IVHS

Linnartz, Jean-paul M. G.
Walrand, Jean
1993

This report summarizes the need for (dedicated) radio spectrum for IVHS communication services. It concludes that, if efficient architectures can be developed, several MHz of spectrum will be needed for large-scale introduction of IVHS services. Compared to most other reported estimates of the spectrum requirements, this report gives a more detailed discussion of the relation between message volume (bit/sec), the required grade of service and spectral bandwidth (Hz).

AHSCAP Dynamic Traffic Assignment Program User’s Manual and Design Description

Hongola, Bruce
1996

This research seeks to provide an understanding of the capacity and throughput require- ments of an automated highway system(AHS) via development of a computer model that represents system capacity and demand, operational characteristics, and defined infras- tructure. To do that, a variety of scenarios representing traffic input to the system must be represented. Also, a variety of infrastructures representing different system configurations must be represented. This includes the locations of entrances and exits.Detailed vehicle-based simulations have been used to investigate AHS capacity...

Evaluation of UC Davis Long-Range Transportation, Land-Use, and Housing Plans: Examining the Potential for Innovative Mobility Pilot Projects

Finson, Rachel S.
Shaheen, Susan A.
2001

At present, the City of Davis, surrounding communities, and the UC Davis campus are struggling with many of the same transportation problems that plague larger urban centers including increasing traffic, limited parking, and challenges to effective operation of the public transit system. The campus is expecting to grow by 6,000 students in the next ten years (plus approximately 3,000 faculty and staff) and is developing a Long-Range Development Plan (LRDP) that will serve to guide this growth. This plan will include housing, traffic control, parking, alternative transportation modes, and...

Visualizing Loop Detector Data

Zhang, Xiaoyan
Rice, John
1999

Over the years, many TMCs have accumulated large loop detector datasets due to the loops' extensive presence in existing infrastructure. However, the information in these data sets often lies dormant partly because of the lack of effective means to summarize and display it. We present a simple visualization technique developed for loop detector data which addresses this issue. The method uses color-encoded images to visualize loop detector measurements as a function of space and time. We use examples based on a field dataset to illustrate some of its possible applications.

Assessing The Benefits Of A National ITS Architecture

Hickman, M.
Weissenberger, S.
Dahlgren, J.
1996

This paper describes the results of an assessment of benefits from an Intelligent Transportation Systems (ITS) architecture, based on the National ITS Architecture Development program. Benefits of the architecture include those typically attributed to systems engineering and integration. The architecture provides a common framework so that, in planning and implementing systems, state and local agencies can be assured that ITS products and services are compatible and inter-operable with other ITS products and services. More directly, three beneficial features of the national architecture...

Current and Future Transportation Management High-Level Requirements Technical Memorandum

Zeinali Farid, Yashar
Peterson, Brian
Harrington, Michelle
2021

This document presents a review of the current and future requirements for information exchange between traffic management centers, with emphasis on the changes expected due to the changing nature of transportation and the advances in technology that are becoming prevalent in the transportation ecosystem. The intent of this document is to provide a look at the source of changes required within center-to-center communication and new requirements that will need to be addressed as transportation undergoes significant change due to new transportation modes, technology advances in connected and...

Design Of An Extended Architecture For Degraded Modes Of Operation Of AHS

Lygeros, John
Godbole, Datta N.
Broucke, Mireille E.
1995

In this paper, the authors propose a hierarchical control architecture for dealing with faults an adverse environmental conditions on an Automated Highway System (AHS). The design builds on a previously designed control architecture that works under normal conditions of operation. The faults that are considered in the design are classified according to capabilities remaining on the vehicle or roadside after the fault has occurred. Information about these capabilities is used by the supervisors in each of the layers to select appropriate control strategies. The extended control strategies...