It is proposed to set a simple curve between two straight roads. what were the important elements required for setting and on the ground.

Setting a simple curve between two straight roads involves several important elements. Here are the steps:

1. Tangent Points: These are the points where the curve starts and ends. They are the points of intersection between the straight roads and the curve.

2. Curve Length: This is the distance between the two tangent points along the curve. It is determined based on the sharpness of the curve.

3. Radius: The radius of the curve is a crucial element. It is the distance from the center of the curve to any point on the curve. The radius affects the sharpness of the curve.

4. Deflection Angles: These are the angles formed by the tangent at the point of curvature and the tangent at the point of tangency. They help in determining the degree of the curve.

5. Surveying Equipment: Tools like theodolites, total stations, and level rods are required for setting out the curve on the ground.

6. Pegs/Markers: These are used to mark the points on the ground where the curve will pass through.

7. Drawings/Plans: Detailed drawings or plans of the curve and the surrounding area are necessary for accurate setting out.

8. Safety Equipment: Depending on the location and nature of the work, various safety equipment may be required.

9. Skilled Personnel: Trained surveyors and engineers are needed to accurately set out the curve and ensure it meets the required specifications.

10. Checking: After setting out the curve, it should be checked for accuracy. This can be done by measuring the distances and angles again and comparing them with the planned values.