If visibility is becoming increasingly poor due to foggy conditions, what should motorcyclists do?

Answer: B — Move off the road, find a safe place to park, and wait until the fog clears up before attempting to continue driving.

When visibility is severely reduced due to fog, the safest course of action for motorcyclists is to find a safe place to park and wait until conditions improve. This approach minimizes the risk of an accident that could be caused by reduced visibility, as riding in fog can significantly impair a rider's ability to see other vehicles and obstacles, as well as their ability to be seen. Finding a safe parking spot allows the motorcyclist to avoid the dangers associated with navigating through low visibility. Rather than trying to navigate through the fog, which can lead to losing control or crashing, pulling off the road and waiting is a prudent and responsible decision. This choice ensures not only the safety of the rider but also the safety of other road users. The other options suggest actions that could increase risk. Shifting to the fast lane and trying to drive quickly out of the fog could lead to serious accidents, as visibility and stopping distances would still be greatly impacted. Turning on flashers and parking in a lane could create an unexpected hazard for other drivers. Driving at a reduced speed while using the horn may make a motorcyclist feel more secure, but it does not actually improve visibility and can still result in dangerous situations.