28 THE BALTIC JOURNAL OF ROAD AND BRIDGE ENGINEERING 2021/16(4) * Corresponding author. E-mail: ansis.avotins@rtu.lv Ansis AVOTINS (ORCID ID 0000-0002-7639-5198) Leslie Robert ADRIAN (ORCID ID 0000-0003-4663-276X) Leonids RIBICKIS (ORCID ID 0000-0001-9077-1981) Copyright © 2021 The Author(s). Published by RTU Press This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. ISSN 1822-427X/eISSN 1822-4288 2021 Volume 16 Issue 4: 28–57 https://doi.org/10.7250/bjrbe.2021-16.538 SMART CITY STREET LIGHTING SYSTEM QUALITY AND CONTROL ISSUES TO INCREASE ENERGY EFFICIENCY AND SAFETY ANSIS AVOTINS 1* , LESLIE ROBERT ADRIAN 1,2 , RICARDS PORINS 1 , PETERIS APSE-APSITIS 3 , LEONIDS RIBICKIS 1 1 Institute of Industrial Electronics and Electrical Engineering, Riga Technical University, Riga, Latvia 2 Lesla Latvia Ltd, Riga, Latvia 3 Department of Industrial Electronics and Electrical Technologies, Riga Technical University, Riga, Latvia Received 9 February 2021; accepted 28 July 2021 Abstract. According to standards, the lighting system is one of the key elements to provide safety on city roads, defined by quality parameters. LED technology and movement detection sensor interaction bring about new regulation techniques, creating an energy-efficient smart LED lighting system concept. This paper reveals extensive comparative data analysis of Dialux simulation results before the project implementation phase and in-situ quality parameter measurements for various street profiles and LED luminary power types. After the project implementation phase, more than 1000 measurement points are