Which curve type is considered unsuitable for high-speed highways?

The choice of compound curves being unsuitable for high-speed highways relates to the geometric design principles in road construction and traffic management. Compound curves involve two or more simple curves that have different radii but are connected to create a continuous path. While they can be effective in certain scenarios, they can lead to challenges in maintaining a smooth flow of traffic at high speeds. The transition between differing radii can create discomfort for drivers and potentially reduce sight distance, affecting their ability to negotiate the curve safely at higher velocities.

High-speed highways typically require curves that allow for greater banking and a more consistent radius to facilitate safe and efficient travel. As such, the ideal design for these types of roadways will often favor simple or reverse curves, which maintain a uniform radius and allow drivers to navigate at higher speeds with improved visibility and control.