Never drive directly ________ another rider.

The correct answer emphasizes the importance of maintaining safe distances and positioning while riding a motorcycle. When you drive directly alongside another rider, you may reduce your space for maneuvering and increase the risk of a collision due to shifting positions or sudden movements by either motorcycle. It's more advantageous to maintain a safe distance, which not only allows for better visibility but also provides the necessary space to react to unexpected situations.

Driving directly behind or in front of another rider can also present dangers, but being alongside poses a unique risk in terms of limited space for both riders. Drivers should strive to position themselves in a way that maximizes visibility, safety, and the ability to react to the movements of those around them, enhancing overall rider safety.