12. The apparatus of claim 11 , wherein the processor configured to process is further configured to: correlate the first and second roads with stored information to identify first and second route links associated with corresponding ones of the first and second roads; determine whether the first road intersects the second road; and construct a portion of the routing graph that includes the identified route links when the first and second roads intersect, the identified route links being connected within the routing graph by a corresponding one of the nodes.
11. An apparatus, comprising: a storage device; and a processor coupled to the storage device, wherein the storage device stores a program for controlling the processor, and wherein the processor, being operative with the program, is configured to: receive positional information comprising a plurality of positional data elements, the plurality of positional data elements specifying corresponding longitudes and latitudes at corresponding ones of a plurality of times; process the received information to generate a routing graph, the routing graph comprising a plurality of nodes and one or more route links that connect the nodes, the one or more route links being associated with corresponding link information, the processor being further configured to: identify, from the received information, a first data element and a second data element, the time specified by the first data element being subsequent to the time specified by the second data element; select a first road corresponding to the longitude and latitude specified by the first data element, and a second road corresponding to the longitude and latitude specified by the second data element; determine that the first and second roads correspond to a common route link, based on at least a portion of the link information; and construct a portion of the routing graph that includes the common route link, when the first and second roads correspond to the common route link; and generate, based on the corresponding link information, textual directions for traversing a path representative of the routing graph.