What type of pavement system is subject to continuous abrasion from traffic?

The type of pavement system that is subject to continuous abrasion from traffic is asphalt. Asphalt pavement is commonly used for roads and highways because it provides a durable and smooth driving surface. However, it is also subjected to a high level of wear and tear due to the repeated contact and friction from vehicles. This continuous abrasion can lead to surface roughness and deterioration over time, necessitating regular maintenance and, occasionally, complete resurfacing.

Concrete, while also durable, typically experiences different stress factors and a different wear pattern compared to asphalt. Rigid pavement systems, such as those made from concrete, do not undergo the same level of abrasion since they are generally more resistant to wear from traffic. Flexible pavement refers to the design concept of asphalt layers that can bend and adapt to stresses but doesn't specifically denote the material or its wear characteristics. Thus, asphalt is the correct answer as it specifically highlights the impact of continuous traffic abrasion.