Answer:
Generally compound curves are not filtered recommended for underground road.
Step-by-step explanation:
The curves made of multiple successive arcs are tangentially joined with no reverse of curvature. The curves are obtained from the straight lines by providing a complete swift. While it is least preferred in road ways, the major application of compound curves are used in rail roads, and most of the compound curves could be seen in the design of the interchanging loops and the ramps