A sign with a yellow background featuring a car and wavy light trailing behind the car is a ____________ sign.

Answer: A — Slippery road sign

A sign with a yellow background featuring a car and wavy light trailing behind the car is classified as a slippery road sign. This sign is designed to alert drivers to conditions that can lead to a loss of vehicle traction, such as wet, icy, or otherwise slick roads. The yellow background serves as a warning color, indicating that drivers should approach with caution and be prepared to reduce speed in order to maintain control of their vehicles. The depiction of the car with wavy lines trailing behind it visually suggests that the road surface may be unstable and that skidding or slipping could occur. Recognizing this sign allows drivers to adjust their driving behavior to avoid accidents, particularly in adverse weather conditions where road surfaces may be compromised.