| http://www.w3.org/ns/prov#value | - As mentioned before, some roadway configurations may dictate the spacing of the signpost units 12 to establish open regions such as the open region 79c shown in FIG. 5, and, in some applications, it may be desirable to establish such open regions to reduce the total number of signpost units 12 required to form the unique signpost configuration of the present invention.
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