You are driving at least 20 km/h faster than the green truck. What should you do?

You selected answer 1, which is correct. When merging onto the motorway and you are driving at least 20 km/h faster than the green truck, you should move onto the motorway ahead of the green truck. This aligns with the basic rule that you should adapt your speed to existing traffic and merge in a way that avoids hindering other vehicles or causing abrupt braking. Since you are clearly traveling faster and have enough space, it is both safe and efficient to merge ahead of the slower truck rather than braking or stopping, which could be dangerous and is not required when merging at motorway speeds. Always use your mirrors, indicate early, and accelerate smoothly to fit in with the flow of traffic.