Two possible exceptions might be if someone was injured and they were taking them to the nearest hospital or the Tennessee highway police who were there authorized them to leave (the THP isn’t saying according to the article).
I will however note that if this was a presidential motorcade or foreign head of state/government or someone under Secret Service protection, they would likely have hightailed it out of there in case this was step one of an ambush. They would contact the local police and make arrangements for necessary interviews.
CHATTANOOGA, Tenn. – A dog that ran onto a Tennessee interstate is believed to be responsible for triggering a chain-reaction vehicle crash that damaged four SUVs being used to carry Governor Ron DeSantis to a presidential campaign event last week, according to police video obtained by News 6.
I hope the dog’s okay.