When should you always use the right lane while driving?

Using the right lane while driving is primarily dictated by the principle of keeping the flow of traffic efficient and safe. When you're traveling more slowly than other traffic or navigating on hills with a passing lane, it's essential to position your vehicle in the right lane. This allows faster-moving vehicles to pass you safely on the left, thereby maintaining a smoother overall traffic flow.

Additionally, when driving on hills where a passing lane is present, being in the right lane helps facilitate overtaking by other drivers who may require more speed to safely navigate the incline. This practice not only enhances safety by reducing the likelihood of collisions caused by sudden lane changes but also minimizes frustration among drivers who wish to travel at higher speeds.

In contrast, the other options relate to scenarios where lane selection may not prioritize the greater traffic dynamics. Traveling faster than other traffic is typically done in the left lane, whereas heavy traffic may require more nuanced navigation but does not specifically demand right lane usage as a rule.