Under conditions where visibility is limited to 100 feet or less, what is the maximum safe driving speed?

The safest maximum driving speed under conditions where visibility is limited to 100 feet or less is 20 mph. When visibility is significantly reduced, such as during heavy fog, rain, or snow, it is crucial to reduce your speed to react appropriately to any potential hazards you may not see until they are very close. Driving at a lower speed gives you a greater chance to stop in time if something unexpected occurs, as it also helps maintain better control of the vehicle.

While the other options suggest higher speeds, which may feel more comfortable under normal conditions, they do not take into account the drastic limitations imposed by low visibility. At speeds lower than 20 mph, drivers can more easily assess their surroundings, respond to obstacles, and avoid accidents.