Trivia Tuesday, May 19

Last week's answer

Question: When designing a high-speed highway curve, engineers don't just jump from a straight line (tangent) into a circle. They use a Spiral Transition Curve. What is the primary mechanical reason for using a spiral rather than a simple circular radius?

Answer: To allow the driver to rotate the steering wheel at a constant, comfortable rate rather than making a sudden jerk.

Spiral transition curves are used to provide a smooth and gradual transition on a highway, allowing vehicles to drive at a consistent speed and direction. They provide a wide-range of safety benefits, traffic improvements, and reduce wear-and-tear on roads and vehicles. 

Sources: The Engineering Community