What gap should be maintained from the vehicle that is driving in front of us?

1. A gap of thirty meters, in order to allow safe stoppage.
2. A gap of forty meters, in order to prevent an accident.
3. A gap of at least three seconds.
4. Correct answer: A gap which always allows us to stop and prevent a collision..

WhyKeep a distance that lets you brake at any moment and avoid a collision. A fixed number of meters ignores speed and road conditions.