1. A method for rolling wheel deflection measurement, comprising: providing a rolling wheel to be moved along a measuring surface in a first direction; providing a frame extending essentially along said measuring surface in said first direction from at least said rolling wheel; providing at least four spaced apart laser range sensors, a first of said range sensors being arranged at a location corresponding to said rolling wheel, and the remainder being arranged as first, second and third preceding range sensors, respectively, in front of said first range sensor in said first direction; scanning in a first time interval a number of lines on said measuring surface corresponding to the target area of each of said range sensors, so as to get a corresponding number of images; scanning in said first time interval a number of lines on said measuring surface using each of said range sensors, so as to get a corresponding number of virtual images, in which the pixel values represent distances; comparing and matching said images using a data processor, so as to identify corresponding regions; and calculating a deflection value using matched pixel values of virtual images from said virtual images based on said identification of corresponding regions.