Hertz recently started implementing an AI–driven vehicle scanner that scans cars before and after rentals to check for damage and issue associated charges.
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/
gravel travels fairly far when the vehicles are going 50 mph
Vehicles also skid very far at that speed.
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/