A method is proposed for calculating the asymmetric luminous intensity distribution of a luminaire for stationary road lighting, in which the properties of directional reflection of light from the road surface are used to the greatest extent. The method is based on the analytical relationship of the luminaire’s luminous intensity in the direction of the calculated point with the luminance of the road surface at this point in the direction of the driver, expressed in terms of the reduced luminance coefficient of this coating. The main provisions and algorithm of the method are given. The features of the calculation depending on the angle of inclination of the luminaire and the layout of the luminaires relative to the direction of movement are shown. According to a specially developed computer program, an example of calculating the asymmetric light distribution of a luminaire is executed and its effectiveness is evaluated in comparison with traditional symmetrical luminous intensity distribution. 1. Handbook on lighting engineering. Edited by J.B. Aizenberg and G.V. Boss, 4th ed. Reprint and added [Spravochnaya kniga po svetotekhnike. Pod red. Yu.B. Aizenberga i G.V. Bossa, 4‑e izd. pererab. i dop.] / Moscow, 2019, 892 p.
2. GOST R 55708–2013 “Utilitarian outdoor lighting. Methods for calculating normalized parameters” (Russian standard). [GOST R 55708–2013 “Utilitarnoe naruzhnoe osveshchenie. Metody rascheta normiruemyh parametrov].
3. Ostrovsky, M.A. Technique of outdoor lighting of cities [Tekhnika naruzhnogo osveshcheniya gorodov / Itogi nauki i tekhniki] // Results of science and technology. Ser. “Lighting and infrared technology”, Vol. 3, Moscow: VINITI, 1973, pp. 5–147.
4. Zhitova, N.P., Ostrovsky, M.A., Ponomarenko, L.A. Calculation of effective luminous intensity distribution curves of luminaires for lighting streets and roads [Raschet effektivnyh krivyh sil sveta dlya osveshcheniya ulits i dorog] // Svetotekhnika Journal, 1975, # 3, pp. 2–5.
5. CIE 132–1999 “Design methods for lighting of roads”.
6. GOST R 55392–2012 “Lighting devices and complexes. Terms and definitions” (Russian standard). [GOST R 55392–2012 “Osvetitelnye pribory i kompleksy. Terminy i opredeleniya”].
7. URL: https://www.light-in-night.com (date of application: 01.02.2023).
8. GOST R 55706–2013 “Utilitarian outdoor lighting. Classification and norms” (Russian standard). [GOST R 55706–2013 “Utilitarnoe naruzhnoe osveshchenie. Klassifikatsiya i normy”].

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• road lighting
• road surface luminance
• asymmetric luminous intensity distribution
• reduced luminance coefficient