Select the correct sentence:

1. Keeping distance is only required to keep distance while driving in high speeds, and when a heavy vehicle or a bus drives in front.
2. Keeping distance is only required when the driver is very tired and his responses are not quick enough.
3. Keeping distance prevents traffic congestion which damages road infrastructures.
4. Correct answer: By keeping proper distance, an overtaking vehicle can enter the space in front.

WhyA distance to the car in front leaves room for someone overtaking you to get back in.