![](https://lemmy.dbzer0.com/pictrs/image/9d88b998-129f-4e28-a089-02fe7f6297ea.png)
I imagine any reasonable traffic law would forbid drivers from impeding traffic like that. You might be able to do it somewhat discreetly, but it’s still a matter of enforcement, and you can bet blue nonces will suddenly start caring about enforcing traffic laws.
Edit: UK Road Traffic Act
If a person drives a mechanically propelled vehicle on a road or other public place without due care and attention, or without reasonable consideration for other persons using the road or place, he is guilty of an offence.
And yet he didn’t actually build the Hyperloop. Could this mean that Elon, the car salesman, secretly loves traffic???