Cross-cutting Issues

Ensuring the integrity and authenticity of location data is becoming increasingly important as businesses and governments use Global Navigation Satellite System data in many new domains such as pay-as-you-drive insurance, variable transportation taxes, logistics auditing, fleet tracking, and IntelliDrive applications.  Location data signing is the technique of producing a digital signature for data obtained from a positioning system, such as the U.S. NAVSTAR Global Positioning System (GPS), in order to prove a mobile device was at a particular location at a given date and time. This paper describes the design and implementation of location data signing within a software system and investigates the overhead, trade-offs, and challenges encountered in a proof-of-concept mobile application for GPS-enabled cell phones. Results from experiments demonstrate that recent advances in mobile device technology now allow for computationally-intensive cryptographic algorithms to execute in a reasonable amount of time and with little noticeable overhead to the user.  The feasiblity of location data signing on mobile devices therefore paves the way for secure uses of GPS data in the transportation domain.

Authors: Marcy E. Gordon, Sean J. Barbeau, Miguel A. Labrador

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

along a freeway corridor were recruited to participate in a laboratory experiment that
used static displays to compare alternatives in terms of how well the viewer is able to
comprehend the message and use the information to reach a decision about route choice. Signs included a range of formatting and content alternatives, including signs with diagrammatic
elements. Among the key findings are that an effective layout is to left justify the destination and right justify the travel time. Simple diagrammatic signs, with linear depiction of the roadway and travel times to two or three destinations, appear acceptable. More complex diagrammatic signs appear difficult to readily interpret. The study also found that the time required to process sign information was positively related to both amount of sign information and self-reported ease of processing. Travel time displays may place undesirable demands on drivers if they exceed three lines of text or six information units. Recommendations based on these findings are provided.

Authors: Emanuel Robinson, Jeremiah Singer, Neil Lerner, James Jenness, Richard Huey

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

This paper will discuss how an ICM solution can not only assist modal shift but how it can effectively promote it. With Traffic congestion at a record high and only destined to get worse, the economy in disarray and limited budget for capital projects, plus a slow realization that road building is at best a short-term stopgap and at worst can actually make the situation worse, agencies are looking at how to maximize the use of their current infrastructure.

Telvent USA Corporation

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

Integrated Corridor Management (ICM) and Active Traffic Management (ATM) have currently captured the practitioners’ imaginations in the USA. ICM allows for the integration of all facility types (freeways and arterials) and modes along a specific corridor, and optimizes flow for all modes of transportation. ATM optimizes the flow along a given section of freeway by utilizing hard shoulders as an extra lane during peak hours, ramp metering, and variable speed limits.

Ulteig Engineering

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

Integrated Corridor Management (ICM) and Active Traffic Management (ATM) have currently captured the practitioners’ imaginations in the USA. ICM allows for the integration of all facility types (freeways and arterials) and modes along a specific corridor, and optimizes flow for all modes of transportation. ATM optimizes the flow along a given section of freeway by utilizing hard shoulders as an extra lane during peak hours, ramp metering, and variable speed limits.

Ulteig Engineering

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