Drivers of buses and trucks often have large blind spots behind and at the side of their vehicle. Stay far enough back so you can be seen in their side mirrors. If you can see their mirrors, they can see you.
Sometimes you'll see tractors and other farm or construction machinery on the road. Because they're large and usually travel slower than other vehicles, you need to be especially careful when driving near them.
Sometimes you’ll see overdimension vehicles, such as vehicles carrying buildings, on the road. Because of their size, and because they travel slower than other vehicles, you need to be careful when driving near them.