In which of the following situations is it permissible for a vehicle to share the lane with a motorcycle?

In Massachusetts, it is important to understand the legal framework regarding motorcycles and lane sharing. The option that states it is illegal to drive beside a motorcycle in the same lane is the correct choice because, under Massachusetts law, motorcycles are entitled to the full width of a lane. This means that other vehicles should not attempt to share the same lane with a motorcycle; doing so can pose a significant safety risk to both the motorcyclist and the other driver.

Lane splitting, or sharing a lane, is not permissible and is viewed as unsafe due to the differences in size, speed, and maneuverability between motorcycles and other vehicles. The law aims to protect motorcyclists by ensuring they have enough space to operate safely without the risk of being squeezed by larger vehicles.

The other options do not address the legal restrictions on sharing a lane. For instance, signaling to turn or traveling below the speed limit does not change the fundamental rule that prohibits lane sharing. Similarly, the position of the motorcycle in the right lane does not alter the legal requirement for vehicles not to share the lane with motorcycles. Understanding and abiding by these regulations helps ensure the safety of all road users.