Method for locating and/or measuring the speed of a vehicle

A system for geolocation of vehicles traveling on a guideway, comprising:

• markers distributed along the guideway, each of the markers having a common physical characteristic that varies among the markers, each marker belonging to one and only one class among a plurality of classes correlated to variations of the common physical characteristic, the sequence of categories of markers along the guideway being random;
• and
• at least one vehicle configured to travel along the guideway, the at least one vehicle comprising:
• a sensor configured to detect the physical characteristic of each of the markers as the vehicle passes adjacent the respective marker;
• and
• a computer configured to receive a signal from the sensor, the signal corresponding to the detected physical characteristic, and to identify the category to which each marker respectively belongs as the vehicle passes adjacent the respective marker, the computer configured to record sequences of the detected categories of markers identified by the computer, the computer further storing the random sequence of categories of markers along the guideway, the computer configured to compare the recorded sequences with the stored random sequence of categories of markers along the guideway and determine a location of the vehicle along the guideway.