You must be aware of sudden, dangerous situations when: 1. visibility is severely restricted; 2. Persons or animals could unexpectedly appear on the road. In the case of limited visibility, you may detect obstacles such as broken vehicles on the roadway too late. You have less time to react accordingly. In forest areas you have to expect wild animals crossing suddenly during dusk times; in residential areas you have to expect children playing on the street. Caution is also required in front of schools and at school bus stops.