A person may not drive so slowly as to impede what?

Driving too slowly can create challenges on the roadway by disrupting the natural flow of traffic. When a vehicle is traveling significantly below the speed limit or is otherwise obstructive, it can cause delays for surrounding vehicles. This slowdown can lead to congestion and may prompt hazardous maneuvers from other drivers as they attempt to navigate around the slower vehicle.

Maintaining a reasonable speed helps ensure that traffic can move efficiently, allowing drivers to anticipate traffic patterns and operate their vehicles safely. While it is essential to be cautious and obey speed limits in specific scenarios, particularly in residential areas, a driver must ensure they do not impede the movement of normal traffic on major roads and highways, where maintaining a steady pace is crucial for overall safety and fluidity.

The other options highlight different scenarios where specific rules may apply, but the essential principle here focuses on the broader concept of normal traffic flow, which stems from a basic duty of motorists to use roadways responsibly without creating hazards through excessive slowness.