This report defines a novel dynamic spectrum access technique that uses the highway metaphor as the basis for design and applications. As described in this report, a spectrum highway consists of a band of spectrum over a geographical area that is subdivided into smaller bands called lanes and those lanes support access to any number of spectrum-dependent systems (SDSs). The devices that comprise the SDS follow rules that govern their selection of spectrum highways and lanes and the way devices contend for access using signaling. With this construct, signaling is very effective at arbitrating access. This signaling differentiates access based on the precedence of the contenders and resolves contention. These highways support spectrum use in very congested and dynamic spectrum environments.