

Your safe following distance on gravel at 50mph is more than that. 3 seconds is your minimum following distances on normal surfaces (used to be 2, advice has changed), you should have a 4 second following distance on gravel. https://www.drive-safely.net/safe-following-distance/
they do open windows. They also close them. When they do that depends on the situation.
livewise they sit outside at times. They also sit insides.
There are many different hot climates with different situations. You cannot make a blanket statement. And you cannot look at what they do today when ac is common to figrue it out (where at is common)