It starts raining. Why must you immediately increase the safe distance?

You answered correctly. When it starts to rain, the road surface can become very slippery because of the oily residue that builds up, especially after a dry period. This greasy film increases your braking distance, meaning you need more space to stop safely. Additionally, rain can reduce visibility, and windscreen wipers often need a moment to clear the view completely. Both factors make it essential to increase the distance to the vehicle in front immediately for safety. The idea is to ensure you have enough time and space to react if something happens suddenly on the wet road. The statement about brakes reacting more quickly is incorrect; brakes can actually be less effective in wet conditions. Remember: increase your safe distance as soon as it starts raining to reduce accident risks.