What is the primary use of an easement curve in roadway design?

The primary use of an easement curve in roadway design is to smoothly transition vehicles. Easement curves are designed to gradually change the alignment of a roadway, allowing vehicles to navigate turns more comfortably and safely. This transition is essential for maintaining control and ensuring that drivers do not experience abrupt changes in direction, which can lead to safety hazards, especially at higher speeds.

Incorporating easement curves helps to reduce the lateral forces acting on vehicles, thereby enhancing the overall driving experience. This is particularly important in areas where the road geometry changes, as it allows for a seamless flow of traffic and reduces the risk of skidding or overturning.

While creating a straight path or providing drainage may be considerations in roadway design, they do not specifically pertain to the function of an easement curve. The focus of an easement curve is primarily on facilitating a gradual and smooth transition for vehicles rather than on increasing vehicle speed.