Vertical Curve Shape:

The shape of the vertical curve generally provided is parabolic.

Explanation:

A vertical curve is a curve that is used to connect two different grades of a roadway or a highway. The vertical curve is used to provide a smooth transition between the two different grades. The shape of the vertical curve plays an important role in providing a smooth transition between the two grades.

Types of Vertical Curve:

There are four types of vertical curves that are used in roadway design. They are:

1. Crest Curve: A crest curve is used when there is an upward slope followed by a downward slope.

2. Sag Curve: A sag curve is used when there is a downward slope followed by an upward slope.

3. Summit Curve: A summit curve is used when there is a level roadway followed by an upward slope.

4. Valley Curve: A valley curve is used when there is an upward slope followed by a level roadway.

Shape of Vertical Curve:

The shape of the vertical curve generally provided is parabolic. The parabolic shape is used because it provides a smooth transition between the two grades. The parabolic shape is also easy to calculate and design. The parabolic shape is the most commonly used shape for vertical curves.

Advantages of Parabolic Shape:

There are several advantages to using a parabolic shape for vertical curves. They are:

1. The parabolic shape provides a smooth transition between the two grades.

2. The parabolic shape is easy to calculate and design.

3. The parabolic shape is the most commonly used shape for vertical curves.

4. The parabolic shape is aesthetically pleasing.

Conclusion:

In conclusion, the shape of the vertical curve generally provided is parabolic. The parabolic shape is used because it provides a smooth transition between the two grades and is easy to calculate and design. The parabolic shape is the most commonly used shape for vertical curves.