Researchers conducted a lab experiment to see how well bioretention cells can remove microplastics from stormwater runoff from roads. They used artificial samples based on different types of roads and tested two types of vegetation. Results showed that the bioretention cells removed 92.4% to 99.3% of microplastics, with an average of 97.2%. The type of vegetation and discharge variation didn't affect the removal efficiency. Hibiscus vegetation was better at removing microplastics at greater depths compared to Vetivera vegetation.