A method of measurement of characteristic quantities of reflection of light on a road surface, according to which method a luminous flux from a light source is directed at an angle α to the road surface, after which the luminance of the light reflected from the road surface is measured at an angle β, and based on the data obtained, a luminance coefficient and a reduced luminance coefficient are calculated, wherein the method comprises the steps: a. before directing light from the light source to the road surface in order to obtain said data, measurement lighting conditions are adjusted, pursuant to which i. a bundle of light rays from the light source shielded from external influences by a protective tubular element is directed at an angle α to the surface of a sensor of a calibrating illuminance meter placed at a measuring point on the road surface, ii. a position of a centre of a surface of the sensor is aligned with the measuring point of the road surface, iii. a luminous flux of the light source, the falling angle α of the bundle of light rays of the light source and a distance l between the light source and the centre of the sensor surface are adjusted, iv. lighting measurement conditions are ensured, and then, the values obtained for the illuminance, spectral distribution of light and colour temperature on the surface of the sensor are taken as reference values. Thereafter b. the bundle of light rays from the light source from influences is directed, according to the adjusted measurement lighting conditions, to the measuring point on the road surface from the light source, and c. as a result of the impact of the bundle of light rays free from the influences quantities of reflection of light on the road surface, under the luminance measurement conditions adjusted for a sensing element of an luminance meter, measured characteristic quantities of reflection of light on the road surface surrounding the measuring point on the road surface are fixed. Thereafter d. the measured quantity values are transferred to a programme-based calculation model and the measurement results for characteristic quantities of reflection of light on road surface are obtained from the calculation model together with the uncertainty of the results, results are presented on an indicating device or a computer screen. a. before directing light from the light source to the road surface in order to obtain said data, measurement lighting conditions are adjusted, pursuant to which i. a bundle of light rays from the light source shielded from external influences by a protective tubular element is directed at an angle α to the surface of a sensor of a calibrating illuminance meter placed at a measuring point on the road surface, ii. a position of a centre of a surface of the sensor is aligned with the measuring point of the road surface, iii. a luminous flux of the light source, the falling angle α of the bundle of light rays of the light source and a distance l between the light source and the centre of the sensor surface are adjusted, iv. lighting measurement conditions are ensured, and then, the values obtained for the illuminance, spectral distribution of light and colour temperature on the surface of the sensor are taken as reference values. Thereafter i. a bundle of light rays from the light source shielded from external influences by a protective tubular element is directed at an angle α to the surface of a sensor of a calibrating illuminance meter placed at a measuring point on the road surface, ii. a position of a centre of a surface of the sensor is aligned with the measuring point of the road surface, iii. a luminous flux of the light source, the falling angle α of the bundle of light rays of the light source and a distance l between the light source and the centre of the sensor surface are adjusted, iv. lighting measurement conditions are ensured, and then, the values obtained for the illuminance, spectral distribution of light and colour temperature on the surface of the sensor are taken as reference values. Thereafter b. the bundle of light rays from the light source from influences is directed, according to the adjusted measurement lighting conditions, to the measuring point on the road surface from the light source, and c. as a result of the impact of the bundle of light rays free from the influences quantities of reflection of light on the road surface, under the luminance measurement conditions adjusted for a sensing element of an luminance meter, measured characteristic quantities of reflection of light on the road surface surrounding the measuring point on the road surface are fixed. Thereafter d. the measured quantity values are transferred to a programme-based calculation model and the measurement results for characteristic quantities of reflection of light on road surface are obtained from the calculation model together with the uncertainty of the results, results are presented on an indicating device or a computer screen.