Final answer:
The risks posed to motorcyclists from turbulence caused by large vehicles include loss of balance and difficulty maintaining control, especially when passing. Answers A and C correctly describe the impact of turbulence on motorcyclists.
Step-by-step explanation:
The risk posed to motorcyclists from turbulence caused by large vehicles is significant. Turbulence can negatively affect a motorcyclist's balance and ability to maintain control, creating risk especially when the motorcyclist is trying to pass the large vehicle. Answers A and C correctly address this.
- Turbulence caused by large vehicles can negatively affect the motorcyclist's balance, creating risk to the motorcyclist when trying to pass the large vehicle.
- Turbulence caused by a large vehicle can negatively affect the motorcyclist's ability to maintain firm control on the motorcycle, creating risk to the motorcyclist while passing the large vehicle.
As for the other options, turbulence at high speeds remains a problem and is not only restricted to slow speeds. Furthermore, turbulence is generally disruptive rather than helpful, so it does not provide a forward pull on the motorcycle but instead can make handling the vehicle more difficult.