This has been almost 30 years ago, but I remember not too long after the double nickel went national North Carolina had two state troopers run side by side dead on 55 the length of I-85 all the way from Virginia state line to South Carloina line south of Charlotte. Best I recall, by the time they made South Carolina traffic was backed up to Charlotte.
I remember the Highway Patrol spokesman sounding quite pleased with himself, made some crack about doing it regularly, but they must have caught some powerful heat over that stunt. Best I heard of it was NEVER repeated.