Adverse Visibility Information System Evaluation (ADVISE): Interstate 215 Fog Warning System
The purpose of the Adverse Visibility Information System Evaluation (ADVISE) was to evaluate a real-time, motorist warning system. In response to this, the Utah Department of Transportation Research Division managed a project to develop, deploy and evaluate a fog warning system on Interstate 215 south of Salt Lake City, Utah. One of the objectives of the study was to determine if a speed advisory reduced the mean speeds and/or the variability in speeds between vehicles during low visibility fog events. The conclusion of this study was that a fog warning system appears to be most influential on exceptionally slow moving vehicles/drivers, which after seeing the messages displayed by electronic signs, increase speeds to the predominant traffic flow speed. The use of a speed advisory was considered successful because it reduced the variability between vehicle speeds, a leading cause of incidents.
The potential and feasibility of a personal access satellite system which will offer the user freedom and mobility are being explored. The authors define the system concept and applications, present a strawman design, and identify the enabling technologies. The system as currently conceived could provide voice and data services to users in the contiguous US in the late 1990s to the early 2000s using the 20/30 GHz bands. >