Final answer:
When making right turns, buses and trucks need to start from the left side of the road to safely navigate the wide turning radius without hitting the curb or roadside objects.
Step-by-step explanation:
Buses and trucks, due to their large size, often require extra space when navigating turns, especially right turns, on roadways. The correct position these vehicles need to move to in order to make a right turn is option 2) On the left side of the road. This maneuver is necessary because these large vehicles have a wider turning radius, meaning their back end swings out. If they do not start from the left side of their lane, they risk running onto the curb or hitting objects on the roadside with the back of the vehicle.
So, when making a right turn, the driver of a bus or truck will often pull to the left side of their lane or even into an adjacent lane if it is safe and legal to do so, in order to create enough space for the turn. Then, as they execute the turn, they ensure that the rear of the vehicle does not strike anything and safely completes the turn.