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Although technology has brought marvels in mobile computing, it has provided means to use all of the radio resources on which mobile computing depends. Wireless networks are a hundred times faster than just ten years ago, but their rich, interactive, streaming-oriented applications consume all available capacity and demand more. Managing this critical radio resource and determining the most effective spectrum-allocation policies require an understanding of what constitutes the most efficient use of spectrum.

Two extremely common activities that people engage in are driving and interacting with their mobile broadband devices. Although sometimes people do both at the same time, these have largely been two separate industries. Now they are converging--one might even say they are on a collision course, although avoiding collisions is actually one of the primary objectives for people working in this industry.

It sounds so appealing. You have a valuable resource but you don't need it all the time. Why not let somebody else use it when you're not using it? The resource in this case is spectrum, and the primary user for the bands under consideration is the government.