1. A method of measuring road markings includes the steps of: a) project a mono coloured laser beam line onto the road including a portion on the road surface and a portion on the road marking; b) take image readings with a camera to capture reflection of the laser beam; c) filter out all colours except laser colour; d) apply a thresh-hold filtering such that only a histogram of points having a predetermined minimum brightness remain; e) calculate the road-paint boundary; f) model the road surface under the road marking; and g) convert the road marking measurements to a height above the road surface.