What type of equipment must commercial vehicles have for safe operation?

Answer: B — Reflective triangles

Commercial vehicles are required to carry reflective triangles for safe operation. These triangles serve as a warning signal to other drivers when a vehicle is stopped on the roadway, especially in cases of emergency or breakdown. Their bright colors and reflective surfaces ensure that they are visible, even in low-light conditions, making them an essential safety feature for preventing accidents. In particular, the use of reflective triangles helps to alert other vehicles to the presence of a stationary vehicle, thus allowing them to exercise caution and maintain a safe distance. These triangles are typically placed at appropriate distances behind the vehicle to provide adequate warning and are a standard safety requirement enforced by driving regulations. While GPS navigation, extra fuel storage, and all-terrain tires can be beneficial or even necessary in specific circumstances, they are not universally required equipment for the safe operation of commercial vehicles. Therefore, having reflective triangles is a critical safety measure mandated for all commercial drivers to ensure their safety and the safety of others on the road.