When overtaking on an express way, which side should you use if the vehicle in front is going slower than the maximum speed?

When overtaking on an expressway, you should use the left side if the vehicle in front is going slower than the maximum speed. This is because expressways typically have specific rules to ensure efficient traffic flow and safety. The left lane is designated for faster-moving vehicles and is the correct choice for overtaking.

Using the left side allows you to maintain a smoother traffic flow and avoids unnecessary congestion. It is also important to signal your intention to overtake and ensure that the road is clear before moving into the left lane.

In many regions, including Belgium, overtaking on the right is generally prohibited, as it can lead to dangerous situations and disrupt the proper flow of traffic. Therefore, keeping to the established rules about the sides for overtaking not only enhances safety but also promotes better adherence to traffic laws.