 This study investigates the effectiveness of adding fibers to asphalt mixtures as modifiers. Basalt and bamboo fibers are used to test the impact on the performance of asphalt mastics. The study finds that both fibers can increase the stiffness of asphalt mastics, but the amount of improvement depends on the type of fiber used. Additionally, the study shows that the addition of fibers does not have a significant effect on fatigue resistance or low-temperature cracking. However, the study also found that bamboo fibers outperform basalt fibers when it comes to increasing the resistance of asphalt mastics to high-temperature rutting. This article was authored by Ting Ting Sia, Wan Wan Run, Fang Chen, and others.