In which cases are you obliged to slow down?

1. You are only obliged to slow down in case of busy traffic.
2. Correct answer: When encountering or overtaking an animal.
3. There is no obligation to slow down. There is an obligation to drive carefully.
4. You are obliged to slow down in an urban road only.

WhyYou must slow down when you meet or overtake animals. They may suddenly jump under your wheels.