Final answer:
A chevron is a road sign that provides additional emphasis and guidance for drivers when there is a horizontal change in direction ahead, such as a sharp curve.
Step-by-step explanation:
A permanent sign that provides additional emphasis and guidance for the driver for a horizontal change in direction ahead, especially a sharp change, is called a chevron. These signs are used to indicate curves in the road, with the series of arrows pointing in the direction the driver should follow. Chevron signs are especially important at night or in bad weather when the road's path may not be as visible.
Chevron signs are part of a universal set of traffic signals and signs, helping to guide drivers safely through various road conditions and layouts. Understanding the meaning of road signs is crucial for safe driving and is an important aspect of driver's education.