Why are sand filled buckets kept at petrol station?

Sand-filled buckets are kept at petrol stations as a safety measure to extinguish small fires. In the event of a fire, sand can smother flames by cutting off the oxygen supply, which is crucial in preventing the fire from spreading. They provide a non-toxic and effective means of controlling fires that may arise from flammable materials present at the station. Additionally, having such safety equipment readily available complies with fire safety regulations.