Final answer:
Drivers are at risk in a large vehicle's blind spot because they may not be seen, leading to possible collisions and increased chances of injury due to size differences.
Step-by-step explanation:
Car drivers are at risk when they are in a large vehicle's blind spot because the driver of the large vehicle cannot see them. This lack of visibility means that if the larger vehicle tries to change lanes or maneuver, they might collide with the smaller car, potentially causing a car accident. Moreover, due to the significant size difference between vehicles, occupants in the smaller vehicle may be at a higher risk of injury.