Cross-cutting Issues

This paper compares the benefits of several different communications systems for fulfilling
the goals of Vehicle Infrastructure Integration envisioned by the US Department of
Transportation, including Cellular, WiFi, WiMax, Satellite, and DSRC. It concludes that
DSRC offers the most useful functional and performance attributes.

Cogenia Partners, LLC

Booz Allen Hamilton

Presented at the 15th World Congress on Intelligent Transport Systems, November 16-20, 2008, New York, New York

We developed a practical vehicle-infrastructure cooperative driving support system by
expanding the common platform of ITS on-board unit(1). During the Tochigi DSSS (Driving
Safety Support Systems) test operations, which is the first field test of DSSS for right/left
turning at the intersection on the public road in Japan(7), we evaluated feasibility of the system
and functional effectiveness for DSSS. With the cooperation of road-side and onboard DSSS
control systems, the driver is enabled to notice “invisible risks ahead” timely.

Mitsubishi Electric Corporation

Presented at the 15th World Congress on Intelligent Transport Systems, November 16-20, 2008, New York, New York

This paper addresses the distributed position and orientation estimation problem
in ad-hoc vehicle networks using decentralized ltering. Specically, a cooperative distributed
lter for enhancing the estimation accuracy of vehicles state from uncertain position data
is proposed. The lter relies on a variety of position measurements obtained from the on-board vehicle localization system, from other nearby cooperating vehicles, as well as from the
immediate roadside environment via communication. Direct distance measurements between
vehicles and between vehicles and the static elements of the infrastructure can be used, if
available, as highly accurate reference measurements. The paper demonstrates how successfully
the idea of cooperative ltering in addressing the demands of both fault tolerance and enhanced
estimation accuracy in ad-hoc vehicle networks can be used. The availability of the distributed
sensory system that depends on cooperative vehicle communication is a prerequisite of the
applicability of the idea.

Hungarian Academy of Sciences

University of Los Andes

Ramsys Inc.

Presented at the 15th World Congress on Intelligent Transport Systems, November 16-20, 2008, New York, New York

This paper presents an effort to develop a simulation testbed for the evaluation
of ramp metering algorithms using CORSIM’s Run-Time Extension (RTE), which provides
exported functions and shared structures to communicate between the CORSIM micro-simulator and the algorithms.  A simulation network with 12 metered on-ramps for an 11- mile
stretch of the I-95 corridor in Miami- Dade County, Florida was used to compare the results
from three alternatives: fixed-time ramp metering control, Seattle fuzzy logic ramp- metering
control, and no ramp metering.  Results show that ramp meters are generally beneficial and
that the Seattle fuzzy logic algorithm with only globally configured parameters outperforms a
well-calibrated fixed-time control strategy especially under congested conditions.  The
simulation testbed developed in this research also makes possible the evaluation of additional
ramp metering algorithms in a widely used simulation model in the United States.

Florida International University

District 6 Florida Department of Transportation

Presented at the ITS America Annual Conference and Exposition, November 16-20, 2008, New York, New York

Computer simulation has become a widely used tool in transportation engineering with a
variety of applications from scientific research to traffic planning and traffic management
strategies evaluation. In this paper we present a Corsim-based simulation framework that
illustrates the use of a microscopic traffic simulator to model an evacuation operation driven
by real-time control strategies. The framework was developed to assess the performance of a
set of evacuation algorithms previously proposed as part of a Smart Traffic Evacuation
Management System (STEMS). Therefore, our proposed simulation framework will be
presented in the context of STEMS.

University of Central Florida

Florida Atlantic University

Presented at the ITS America Annual Conference and Exposition, November 16-20, 2008, New York, New York