Final answer:
Truck visibility ahead depends on context; elevated driving positions may provide excellent visibility, but sizable blind spots exist.
Step-by-step explanation:
The statement 'truck drivers have excellent visibility ahead' is not necessarily true or false without context; it requires situational clarification. In some cases, trucks have elevated positions that allow drivers to see over smaller vehicles, potentially offering excellent visibility. However, due to their size and the design of the truck, there may also be significant blind spots. Things like a car traveling east toward an intersection, a child ahead by a certain distance, or other vehicles on the road, such as in figure 1.2.9 with cattle, can affect truck driver visibility and need to be taken into account for safety.