Where are sand and gravel most likely to collect on a paved road?

Sand and gravel are most likely to collect on the shoulders of the road due to the natural accumulation from vehicles and environmental factors. When cars travel on a roadway, they can displace smaller particles like sand and gravel, which are then pushed to the sides by the tires. Additionally, during rainstorms or heavy winds, these materials may wash or blow off the road surface and collect along the shoulders, where they are less frequently disturbed by traffic.

The other options are less probable for sand and gravel accumulation. For example, the center of the road typically experiences more traffic, which would keep it clearer of debris due to constant movement. Intersections can indeed see debris, but this tends to be the result of turns or stopping, rather than the consistent accumulation seen on shoulders. Lastly, the left lane, which may be designated for faster-moving traffic, would also not hold as much debris since it is actively trafficked. In contrast, shoulders serve as areas where materials can settle without much interference.