[n4r9]

For context, that's a very specific kind of roundabout that you find near the junction of a motorway (the M1) with a primary road (the A630). The roundabout is situated on the A-road and accessed from the motorway by a slip road. That way, motorway users who don't care about the junction can just keep cruising forwards and drive over the top of the roundabout. Nevertheless, drivers can approach from any direction and exit in any direction (including back the way they came). It doesn't look like this is the case in OP's article; I'm not sure how someone approaching from the left can continue in the same direction and drive off to the right.

Roundabouts generally look more like this in the UK (without any overpassing roads): https://www.google.com/maps/place/Howarth+Ln,+Rotherham/@53....

[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.