A farm tractor is approaching you at dawn with its headlights switched on. What must you reckon with?

The selected combination correctly identifies critical considerations when encountering a farm tractor at dawn.

1. The tractor may carry large equipment that is difficult to see, posing a risk to other road users, especially in low visibility conditions.
2. Although the headlights are on, the actual width of the tractor may not be obvious, which is crucial for maintaining a safe distance.
3. Tractors can indeed pull wide trailers, further complicating visibility and the potential hazard they pose to other vehicles.

According to German traffic rules, it is vital to be aware of these factors to ensure safe driving practices, particularly around slower-moving vehicles like tractors. Considering all relevant options helps drivers make informed decisions and maintain road safety.