John Sturdy <[email protected]> writes:

> Jersey barriers have a specific tapering profile; the blocks I'm thinking
> of are typically simple cuboids.
>
> They also have different purposes: a Jersey barrier is meant to deflect a
> vehicle back into a lane of traffic when struck at an oblique angle;
> Hostile Vehicle Mitigation barriers are placed at right angles to the
> expected line of approach, and are meant to stop the vehicle altogether.

John is exactly correct here.

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