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.
The politicians prolly told him if the Highway Patrol kept that stuff up he'd make clear that the beltway boys were doing exactly what Rand says implementing the double-nickel in the first place. Can't have that, not with control at stake.