When you see the following traffic sign before you:

1. A Trucks are permitted to drive from your opposite direction.
2. B You are entering a road with two lanes to each direction.
3. C You are on a one-way road, which serves as a two-way road for vehicles with an overall weight of up to 3,500 kg.
4. D You are entering a road section in which the traffic from the opposite direction is public transport only or any other vehicle permitted according to the sign.