You should increase your following distance when:

You are being followed closely by another vehicle.
Following a motorcycle.
Driving behind a large vehicle that blocks your vision.
All of the above.
Explanation

While maintaining a safe following distance is always essential for reaction time and to avoid potential hazards, certain situations require even greater space, for example:
- When a large vehicle blocks your view ahead (you'll need extra distance to see around it)
- When another driver tailgates you (allowing more space in front lets them pass sooner)
- When following a motorcycle (if the rider falls, you'll need extra distance to avoid the obstacle)

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