That had to be one of their earlier episodes. it was goofy and unfortunately they had a wet road to try and make time on.
It is definitely not socially correct to close the road (legally) then see how fast a time they can make with the cars back and forth. The CHP was required to cooperate given the film permits and all, but you could see they were not happy about it: way too many noobs pile themselves on mul hwy.
the bad boy side of me would have liked to see them on dry pavement- that would have been a lot more interesting
They are both talented drivers