What type of joint is typically recommended for maintaining a smooth ride in Hot Mix Asphalt?

The correct answer identifies the butt joint as the recommended type of joint for maintaining a smooth ride in Hot Mix Asphalt (HMA). A butt joint involves placing two freshly laid layers of asphalt directly adjacent to one another without any staggered or sloped edge. This method ensures that the transition between the two sections is as level as possible, minimizing any abrupt changes in elevation or surface texture that could disrupt vehicle movement.

Smoothness is a critical factor in road design, as it directly affects vehicle handling and comfort. The butt joint effectively addresses this concern by creating a more seamless and continuous driving surface. When executed properly, it allows for better load distribution and reduces the likelihood of issues, such as bumps or dips, that can arise from other joint types.

Overall, the butt joint's design helps achieve optimal surface smoothness and vehicle safety, making it the preferred choice in HMA applications.