1. An operator controlled highway information system for storing data and information related to the types of services available at selected locations along a roadway, and for providing portions of said data and information related to specific ones of said locations in a recognizable human language as selected by said operator, and in response to distance indicator input data provided by said operator, comprising: a selected mass storage means for permanently storing data in digital form relating to services available along a selected roadway, elements of said data being contained in a multiplicity of data groups, each of said data groups indexed according to distance indicators along said roadway, and each of said data groups being accessible according to said distance indicators; input data entry keyboard for providing selectable data as input digital signals by said operator, said input digital signals including selected ones of roadway designation signals initiated by roadway designation keys for selecting a designated roadway, direction of travel signals initiated by directional keys for selecting which direction the permanently stored data is to be scanned, distance indication signals initiated by numerical keys for selecting a designated roadway location, and special control signals initiated by control keys for causing said system to repeat the previous system response or for causing said system to sequentially scan the permanently stored data in a designated direction; a random access digital storage means for repeatedly receiving and temporarily storing selected and varied data; a read only memory for permanently storing in digital form controlling data, said controlling data including an instructional program for controlling said system, and for providing interaction between said operator and said system to solicit input information from said operator, such interaction from said operator to said system by means of said input data keyboard, and from said system to said operator by means of a speech synthesizing means as determined by a processing means; speech synthesizing means for receiving and converting digital data, including selected portions of said instructional program stored in said read only memory, and selected ones of said multiplicity of data groups, into output signals representative of said received digital data for providing audible or vocal sound representations of such data in a recognizable language; and processing means for receiving and evaluating said input digital signals, controlling the transfer of said varied data to and from said random access storage means, and the transfer of said selected ones of said controlling data and said multiplicity of data groups to said speech synthesizing means and controlling said speech synthesizing means, said processing means operating in response to said input digital signals and said instructional program.