Despite advancements in vehicle electrification, the energy performance of road infrastructure—especially street lighting—remains an overlooked area of potential carbon reduction. This study investigates the energy performance of street lighting systems on Smocza Street in Warsaw, using standardised indicators to evaluate consumption and efficiency. The results reveal significant over-illumination in several sections, with energy consumption values exceeding standard requirements for the designated lighting class. Based on fixed schedules, traditional lighting control methods offer limited savings (approximately 17%), while dynamic lighting systems—responsive to real-time traffic conditions—can theoretically reduce energy usage by up to 51%. The findings highlight the underutilised potential of intelligent lighting technologies, such as LED systems paired with adaptive controls, which could significantly enhance sustainability without compromising road safety. The transition to dynamic, data-driven lighting strategies – together with stakeholder collaboration – is essential to maximise the decarbonisation effects in urban infrastructure and support the EU’s broader climate goals.