An apparatus for rolling weight deflection measurement comprising a rolling wheel to be moved along a measuring surface in a first direction a frame extending essentially along said measuring surface in said first direction , at least one carrier , a number of spaced apart range sensors arranged on said at least one carrier and configured to measure a distance to said measuring surface at pavement locations passed by the apparatus , a first of said range sensors being arranged at a predetermined location with respect to said rolling wheel , and the remainder of the range sensors being arranged in spaced apart manner in line with said first range sensor in the first direction, at least one inclination sensor configured to measure at least a change in inclination of said at least one carrier , and a data processing means , characterized in that the data processing means is adapted to calculate the curvature of a depression basin formed by the apparatus in the measuring surface when the apparatus is moved along the measuring surface , where the calculating is based on said measured distances and corresponding inclination measurements from said at least one inclination sensor to yield a curvature parameter of the depression basin , the curvature parameter being a value κ calculated using the formula: κ i = d i − 2 d i + 1 + d i + 2 where d i is the deflection measured with the i'th range sensor and the at least one inclination sensor , d i +1 is the deflection measured with the (i+1)'th range sensor and the at least one inclination sensor , d i+ 2 is the deflection measured with the (i+2)'th range sensor and the at least one inclination sensor . a frame extending essentially along said measuring surface in said first direction , at least one carrier , a number of spaced apart range sensors arranged on said at least one carrier and configured to measure a distance to said measuring surface at pavement locations passed by the apparatus , a first of said range sensors being arranged at a predetermined location with respect to said rolling wheel , and the remainder of the range sensors being arranged in spaced apart manner in line with said first range sensor in the first direction, at least one inclination sensor configured to measure at least a change in inclination of said at least one carrier , and a data processing means , characterized in that the data processing means is adapted to calculate the curvature of a depression basin formed by the apparatus in the measuring surface when the apparatus is moved along the measuring surface , where the calculating is based on said measured distances and corresponding inclination measurements from said at least one inclination sensor to yield a curvature parameter of the depression basin , the curvature parameter being a value κ calculated using the formula: κ i = d i − 2 d i + 1 + d i + 2 where d i is the deflection measured with the i'th range sensor and the at least one inclination sensor , d i +1 is the deflection measured with the (i+1)'th range sensor and the at least one inclination sensor , d i+ 2 is the deflection measured with the (i+2)'th range sensor and the at least one inclination sensor . d i is the deflection measured with the i'th range sensor and the at least one inclination sensor , d i +1 is the deflection measured with the (i+1)'th range sensor and the at least one inclination sensor , d i+ 2 is the deflection measured with the (i+2)'th range sensor and the at least one inclination sensor . <EOS>