Cross-cutting Issues

The effect of internal random processing delays and absolute time synchronism errors in cooperative positioning applications is discussed. The need for and general nature of new requirements for time accuracy and synchronism are described.

Cogenia Partners, LLC

Presented at the ITS America Annual Conference and Exposition, May 3-5, 2010, Houston, Texas

Author:      John A.A. Opiola

Senior Partner/Vice President

D’Artagnan Consulting LLC

Presented at the 18th World Congress on ITS, October 2011, Orlando, Florida

The purpose of this paper is to explain the challenges and successes of designing,
implementing and managing the ITS components of the Traveler Information Guidance
and Evacuation Routing (TIGER) system. The paper covers all aspects of the system
including communications, hardware operation, project management, and operations and
maintenance. It examines what worked well from the onset of the project and what
portions could have been changed to ensure a greater level of success. In addition, the
paper examines how several agencies acted in a cohesive manner to deploy a system that
had never been tried before in the state of Minnesota.

Minnesota Department of Transportation

SRF Consulting Group

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

The City of Sugar Land, Texas is constructing a wireless communication network to provide
access to the City’s traffic signals and other traffic related devices. This network will allow City
employees to monitor and adjust traffic signal timing, view images from closed circuit television
(CCTV) cameras, and provide access to other City employees working remotely in the field such
as police officers, building inspectors and public works employees. This project utilizes eight
high sites to develop a wireless backbone. The high sites communicate with the traffic signal
through point-to-multipoint radios to transmit signal information, CCTV video and provide
Wireless Access Points. Fiber Optic interfaces are provided to bring the information back to the
Traffic Management Center at two locations.

Traffic Engineers, Inc.

Presented at the ITS America Annual Conference and Exposition, May 3-5, 2010, Houston, Texas

Multi- level road networks, such as grade-separated interchanges and elevated roads,
have been  increasingly  used  to solve traffic congestions in large cities. Although they can be
represented and visualized in a transport network database, at present it is difficult to guide a
vehicle through such  a multi- level road network because the existing vehicle positioning and
navigation system is mainly 2D based. When navigating a vehicle in a multi- level road network,
identifying vehicle road level location is of equal importance to identifying its planar location.
Existing GPS and altimeters cannot determine the vertical location of a vehicle accurately in a
multi- level road network. This paper proposes to use inclinometer or gyroscope together with a 3D GIS-T database which includes road elevation or slope, to position vehicles vertically for
vehicle navigation in 3D multi- level road networks.

The University of Hong Kong

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