Final answer:
If you placed emergency warning devices four paces (or ten feet) behind your truck, forty paces (or 100 feet) behind your truck, and 40 paces (or 100 feet) in front of your truck, you would be on a two-lane road.
Step-by-step explanation:
If you placed emergency warning devices four paces (or ten feet) behind your truck, forty paces (or 100 feet) behind your truck, and 40 paces (or 100 feet) in front of your truck, you would be on a two-lane road. This is because on a divided highway, the opposing lanes of traffic are separated by a barrier or median, so there would be no need to place warning devices in front of your truck. However, on a two-lane road, there are no barriers or medians, so warning devices are needed for both the vehicles traveling in the same direction behind your truck and the vehicles coming toward your truck in the opposite direction.