IVHS, or Intelligent Vehicle Highway Systems, is a concept rapidly growing in momentum among government, industry, and academia for a variety of reasons. As a key component in the eventual deployment of IVHS technologies, the auto industry can be expected to support its contribution to reduced congestion, improved safety, energy conservation, environmental quality, and more pleasant car ownership. But a number of difficult problems must be solved before the car companies jump in with both feet, including marketability, cost (and resultant price), national and international infrastructure compatibility, assurance that necessary infrastructure will be provided (essentially a government responsibility), product liability concerns, confirmation of benefits, inability to deal with time horizons beyond five to seven years, and depressed economic conditions.