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

You answered correctly. When you encounter a farm tractor at dawn with its headlights on, you have to be cautious for several reasons. The tractor might be carrying large and potentially poorly visible equipment, making it hard to judge its true size—this can extend much wider than what the headlights show. Also, the legal ability to pull two wide trailers means the actual dimensions on the road can be much greater than you first perceive. In low-light conditions, it's especially important to slow down and give extra space because it’s difficult to see the full width and length of agricultural vehicles. Always be prepared for unexpected shapes and sizes on country roads, especially early in the morning or at dusk.