A safe following gap gives you time to see, decide and stop if the vehicle ahead changes speed suddenly.
Your gap should reflect speed, weather, road surface and traffic conditions, including when stationary in a queue.
These examples are for understanding and practice; they are not a promise that a particular mistake will always receive a particular grade.
Following so closely that your view and stopping margin are reduced.
Keeping the same dry-road gap in wet or slippery conditions.
