This paper presents a comprehensive review of UV aging in asphalt binders, a critical but relatively underexplored factor contributing to the premature failure of asphalt pavements.Asphalt binders, which function as the adhesive binding stone aggregates, are susceptible to aging processes that degrade their performance over time.While the impacts of thermal and oxidative aging are well documented, the effects of UV exposure remain less understood, and no standardised test currently exists to evaluate the UV resistance of different binders.UV aging primarily begins at the air-binder interface, where the surface is directly exposed to UV radiation.Intermediates and aging products formed at the surface diffuse inward, affecting the binder′s morphol., chem. structure, and micromechanics.Traditional bulk measurements, such as rheol. assessments of bitumen layers thicker than 1 mm, often underestimate the impact of UV aging, leading to inconsistent findings.This review synthesizes research from 2010 to 2024, identifying key indicators of UV aging, such as the loss of colloidal stability and the formation of carbonyl compounds, and provides evidence-based recommendations for accurately assessing UV susceptibility.It underscores the importance of using wavelengths (320-400 nm), which represent UV-A and constitute most of the solar radiation reaching the Earth′s surface, to effectively simulate real-world conditions.The review also highlights critical research gaps: understanding the chem. reaction pathways involved in UV aging, exploring the moderating effects of aggregate mineralogy and packing, and examining the interplay between UV exposure and other environmental stressors like moisture, temperature, and mech. loads.Addressing these gaps is vital for developing more durable asphalt and protective coating with enhanced resistance to UV-induced degradation