This study investigates the mobilization and transport of macroplastics (>0.5 cm) on land, focusing on the effects of wind and rain. Lab experiments were conducted on terrains with varying surface roughness and slope angles, exposing four types of macroplastics (bags, wrappers, bottles, and cups) to different wind speeds and rain intensities. The results show that macroplastic mobilization probability and transport velocity strongly depend on terrain characteristics and material properties. Wind-driven transport velocities were 1.9 times faster on paved surfaces than on grass, while rain-driven transport velocities were 4.9 times faster on paved surfaces. Macroplastic transport velocities were positively correlated with wind speed but not with rain intensity, suggesting that rain alone does not transport macroplastics unless surface runoff develops. The study highlights the importance of surface runoff in rain-driven transport and shows that macroplastic transport on land is a complex interplay between material and terrain characteristics. The findings provide an empirical basis for models predicting macroplastic transport and emphasize the need to include factors that determine surface runoff dynamics in such models. The study also reveals that certain plastic types, like bags, have higher mobilization probabilities and transport velocities, which could explain their prevalence in natural environments. The results suggest that future models should consider the role of surface runoff and the impact of terrain characteristics on macroplastic transport. The study's dataset can be used to improve models for predicting macroplastic pathways and emissions to rivers and oceans. The study also highlights the limitations of current models and the need for further research on the effects of weathering and sedimentation on macroplastic transport. The findings contribute to a better understanding of macroplastic transport on land and provide insights for developing effective prevention and monitoring strategies.This study investigates the mobilization and transport of macroplastics (>0.5 cm) on land, focusing on the effects of wind and rain. Lab experiments were conducted on terrains with varying surface roughness and slope angles, exposing four types of macroplastics (bags, wrappers, bottles, and cups) to different wind speeds and rain intensities. The results show that macroplastic mobilization probability and transport velocity strongly depend on terrain characteristics and material properties. Wind-driven transport velocities were 1.9 times faster on paved surfaces than on grass, while rain-driven transport velocities were 4.9 times faster on paved surfaces. Macroplastic transport velocities were positively correlated with wind speed but not with rain intensity, suggesting that rain alone does not transport macroplastics unless surface runoff develops. The study highlights the importance of surface runoff in rain-driven transport and shows that macroplastic transport on land is a complex interplay between material and terrain characteristics. The findings provide an empirical basis for models predicting macroplastic transport and emphasize the need to include factors that determine surface runoff dynamics in such models. The study also reveals that certain plastic types, like bags, have higher mobilization probabilities and transport velocities, which could explain their prevalence in natural environments. The results suggest that future models should consider the role of surface runoff and the impact of terrain characteristics on macroplastic transport. The study's dataset can be used to improve models for predicting macroplastic pathways and emissions to rivers and oceans. The study also highlights the limitations of current models and the need for further research on the effects of weathering and sedimentation on macroplastic transport. The findings contribute to a better understanding of macroplastic transport on land and provide insights for developing effective prevention and monitoring strategies.