Did they test this at 3am? It's not clear how else they were able to keep a 30-60 second following distance from the car in front of them on 680 - 3-6 seconds (or less) seems more typical. 30 seconds is half a mile @ 55mph.
Their diagram shows about 2 car lengths between cars, that's around half a second @ 55mph.
Their diagram shows about 2 car lengths between cars, that's around half a second @ 55mph.
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