Why do sand and gravel collect on the sides of paved two-lane roads?

What causes sand and gravel to accumulate on the sides of paved two-lane roads?

A. Less vehicle traffic on the sides

B. Erosion from adjacent landscapes

C. Heavy rain or wind

D. Debris flows in mountainous regions

Answer:

Sand and gravel are most likely to collect on the sides of a paved two-lane road due to less vehicle traffic in these areas, which allows for the buildup of materials carried by natural processes or adjacent activities.

On a paved two-lane road, sand and gravel are most likely to collect on the sides of the road. This accumulation occurs because these areas are less frequently traveled by vehicles, allowing debris from adjacent landscapes and erosion to build up over time. Gravel can be present on road shoulders, especially near natural landscapes or construction zones.

The materials such as coarse sand and gravel carried by water flows or scattering can settle on the road when the water subsides or vehicles driving off the pavement push debris to the edges. High energy environmental conditions such as heavy rain or wind can contribute to the increased collection of these sediments on roadsides as well. Moreover, roads in mountainous or hilly regions are prone to debris flows or mudflows that may deposit larger amounts of materials like sand, gravel, and even larger rocks.