When you increase your **speed** while driving, it is important to **look further ahead**. This is because, as you go faster, you have less time to react to any unforeseen events that may arise on the road.

- **Tunnel vision**: As speed increases, your field of vision narrows, which is known as "tunnel vision". This means you see less of what is happening on the sides and focus more on what is directly in front of you. Therefore, it is crucial to look further ahead to anticipate any situation that may require a quick reaction.

- **Reaction to unforeseen events**: By looking further ahead, you can detect obstacles, changes in traffic, or road conditions with enough anticipation, allowing you to adjust your driving safely.

In summary, as you increase speed, you should focus your attention further down the road to compensate for the reduced reaction time and limited field of vision.