There are way more trucks on the road than will fit in parking at rest areas, and simply parking on the shoulder is a hazard in itself, which is why trucks are required to set out warning triangles, etc. when they have to do it.
> There are way more trucks on the road than will fit in parking at rest areas
Not the ones that are taking multi-day trips. By definition, we've already made room for them since truckers generally sleep at night all at the same time.
This isn't about trucks on a 3-hour haul -- those just won't head out at all until the forecast is good.
And parking on the shoulder is a worst-case scenario if something suddenly happens that wasn't in the weather forecast for the next couple of horus.
