Final answer:
Motorcyclists are at a high level of risk when they are in the blind spot of another vehicle.
Step-by-step explanation:
Motorcyclists are at a high level of risk when they are in the blind spot of another vehicle. The blind spot is an area around a vehicle where the driver's visibility is limited. When a motorcyclist is in this blind spot, the driver of the other vehicle may not see them and may accidentally merge into their lane or make a turn, causing a collision. It is important for motorcyclists to be aware of these blind spots and take caution when riding near other vehicles.