A safe thing to do while driving on long straight stretches of highway on a sunny day is?

A safe thing to do while driving on long straight stretches of highway on a sunny day is to maintain a steady speed and stay within the posted speed limit. It's also important to stay alert and avoid distractions, as monotony can lead to fatigue. Regularly check your mirrors and surroundings to ensure you are aware of other vehicles and any potential hazards. Additionally, taking breaks to stretch and rest can help maintain focus during long drives.