[PaulDavisThe1st]

I picked that one because it matches the sort of intersection covered in TFA.

Also, the motorway passes under the roundabout, not over it.

[n4r9]

Oh I see! Thanks for the clarification. I think my point still stands that the motorway is not interrupted in the case of the roundabout, whilst it is in the diamond intersection.

[PaulDavisThe1st]

Nope, it's not :)

Look at TFA again. Just like the photo I linked to, the motorway (interstate in this case) passes under the 2 bridges.

The local version of this (NM14 & I25) has the interstate passing over on a single bridge, the double diamond is on the "ground level".

[n4r9]

You're right; I hadn't scrolled down to the wide-view shot. I stand corrected.