You should never what along a larger vehicle with its blinker on?

The correct response indicates that you should never pull alongside a larger vehicle that has its blinker on. When a larger vehicle, such as a truck or bus, signals a lane change or turn, it likely means that the driver is preparing to execute that maneuver. Pulling alongside can put you in a dangerous position, as large vehicles have significant blind spots, and the driver may not see you. This could lead to a collision if the larger vehicle moves into the space where you are driving. Maintaining a safe distance from such vehicles allows for better visibility and reaction time for both you and the driver.

In this context, speeding up could place you in a precarious situation of getting caught in the blind spot, changing lanes might also put you too close to the large vehicle, and backing away could create uncertainty and disrupt the flow of traffic. Keeping a safe following distance is always the best practice when larger vehicles are signaling movement.