When is it necessary to use emergency flashers?

Answer: B — When stopped on the side of the road

Using emergency flashers is critical when a vehicle is stopped on the side of the road, as it serves as a warning to other drivers. This situation requires clear communication to ensure safety, indicating that the vehicle is not moving and might pose a hazard. The activation of emergency flashers alerts other road users to exercise caution as they approach the stationary vehicle. It is especially important in low visibility conditions or when the vehicle might not be clearly visible to oncoming traffic. In scenarios like driving over the speed limit, changing lanes, or approaching a traffic light, using emergency flashers would not be appropriate or necessary. These situations do not convey an emergency or warn others of an unexpected hazard; hence, using emergency flashers in those contexts would not effectively communicate the intended alert.