What characteristic defines concrete as a roadway surface?

Concrete is characterized as a nonporous supportive surface, which is essential for a roadway application. This property means that concrete does not allow water or other fluids to pass through it easily. As a result, it provides a stable and durable platform for vehicles.

The nonporous nature of concrete contributes to its strength and rigidity, making it an ideal choice for high-traffic areas where load-bearing capacity is critical. This property helps prevent the deterioration of the roadway due to water infiltration, which can lead to issues like cracking and structural weakening over time.

While options that suggest porosity or elasticity may apply to different materials or contexts, concrete's primary role in roadway surfaces leverages its ability to remain solid and supportive, facilitating safe and efficient vehicle operation.