Which type of curve increases in radius?

The correct choice is increasing radius, as it specifically refers to a type of curve where the radius expands as the curve progresses. This means that as one moves along the curve, the distance from the center point (or axis of rotation) to the curve itself becomes larger. This is an important concept in various fields, including law enforcement driving tactics, where understanding curves can aid in vehicle maneuvering and management of speed.

In contrast, a decreasing radius would imply that the curve tightens, resulting in a smaller radius as one travels along it. A constant radius indicates that the distance from the center remains the same throughout, which is typical in circles. Variable radius suggests that the curve changes but does not specify whether it increases or decreases, making it less precise compared to increasing radius. Understanding these distinctions is critical for applying the right techniques in situational driving scenarios.