What type of joint does a sled runner or joint runner produce?

The correct answer, which identifies the type of joint produced by a sled runner or joint runner, is long horizontal joints. This is because sled runners are typically designed to create a smooth, continuous surface along a horizontal plane, allowing for easier movement and placement of materials during the construction process. The long horizontal nature of these joints contributes to a stable and uniform assembly, which is essential in various applications.

In contrast, other types of joints, such as vertical joints or miter joints, have distinct characteristics that do not align with the function of sled runners. Vertical joints are often used for connecting materials in a vertical arrangement, while miter joints involve angled cuts that create a corner connection, which is not applicable to the function of sled runners. Flush joints, on the other hand, describe a joint where surfaces are even and smooth, but do not specify the horizontal aspect that the question specifically addresses. Thus, the choice of long horizontal joints accurately reflects the unique application and design of sled runners or joint runners in construction contexts.