Abstract: A method and apparatus for providing highway information contained in plug-in data cartridges (22) by means of a micro-processor (24) is disclosed. Selected highway information is stored and made available with respect to distance markers such as mile markers or kilometer markers along a roadway from a mass plug-in data cartridge storage media (22) which permanently stores a multitude of data in digital form related to services and other pertinent information available along a selected roadway. Each of this data is indexed according to distance or mile marker indicators along the roadway. Also included is a ROM (read only memory) storage means (28) and a scratch pad memory or RAM (30) for temporarily receiving and storing data. ROM or read only memory (28) contains the control program for controlling the apparatus. The keyboard (14) or input data entry means allows the motorist to provide the necessary input to indicate the selection of highway from which he desires roadway information.