In the title!

They have not been many new polls other than the POTM series, so I thought I would make the effort to fill the gap.

Coming from me it has to be something where all movements are freeflow. That instantly rules out dumbbells, roundabouts and even more pathetic designs such as the A303/A350 GSJ.

The best three way GSJ is a directional T. Something like the M18/M62 junction works well.

It depends on the situation. Where a diamond, dumbbell or roundabout interchange are needed I'd prefer if the slip roads were built in a straight line with plenty of room to join the main road. That instantly rules out most of the new build disasters that seem to be popping up all over the place.

If both roads are long distance D2s or better then fully grade separated is preferred.

Directional Ts are quite good, but I think I'll stick with the roundabout at the end of my road.

I take it your not a fan of compact grade-separated junctions.

I've often thought, is the space saved by compact interchanges such as those on the A90 and A92 really that great? They might take up less space next to the main road but in order to do so they have to extend further out to each side. Therefore would a simple diamond not be better in terms of space because it'd stick closer to the side of the main road in an area that's already pretty much dedicated to the D2 anyway, whether in terms of the road's landscaping or land-use by the side of the road?

There's also the safety compromise, I always find myself joining a fast D2 at much slower speeds than the mainline which in turn makes me feel more uncomfortable as a driver. The straight run you get from a standard diamond gives you time to match your speed with that of the mainline and better be able to judge the road you're about to join. On a compact junction you tend to have negotiated some tight curve only to find you have all of 2 seconds to join the mainline and hope the cars hurtling towards you will move over so that you don't have to stop completely.

Of course, cost-wise it's far cheaper to build only two sliproads instead of four but are the savings really worth it?

Really, what I meant to put was 'What type of interchange do you most look forward to' but that is too long and sounds terrible.

By compact junction are you meaning something like this?
http://www.openstreetmap.org/?lat=52.89 ... 7&layers=M

(The A46 is currently being widened so the right hand link is currently works access only and the A46 is running as S2 instead of D2) - in this example it seams even more daft as Owthorpe Lane has already been moved north - a tad further and they could have got some proper south facing slips in!

The newish Forfar junctions, along with the new GSJs between Perth and Dundee, are good examples of these "compact" GSJs, and no doubt the ones to which Burns is referring. To be fair, they're definitely better than what was there before (at-grade crossings), even if they're not as good as they could be - realistically, spending millions extra on providing a "full" GSJ to somewhere like Glendoick with a population of six cows isn't going to fly.

Ah, those! I don't mind them too much - but the one in your example is of the design that is confusing to navigate - why can't A90 keep on the straight line? The first one I came across was http://maps.google.co.uk/?ie=UTF8&t=h&l ... 09645&z=17 - I was heading from Wakefield to the A1(M) towards Nottingham and got completely disorientated by it! The A46 example is much better in this regard!

It was more the ones around Forfar and Carnoustie I was referring to which I don't like using myself. I've never had to use or seen many cars using the Glendoick before so it's irrelevant really. However, how many garden centres can claim to have a specially built grade separated junction for them?

I voted Trumpet and Directional T because they look the nicest on google earth

Where are 4 level stacks and parclos?
Is whirlpool the kind of junction that is usually called turbine?
And what the heck is Almondsbury?

I think the latter covers your former...

http://en.wikipedia.org/wiki/Almondsbury_Interchange

If cows could fly they wouldn't need a GSJ!

A parclo (part cloverleaf)

Yes, e.g. M3/M25 or M11/M25

Yes, as posted upthread, though I don't know about "usually." I would posit that turban is a more common word for this interchange form.

Having never previous seen any cars using it before, I saw two using the Glendoick junction today! Guess at least somebody must want to go there.

Gardening season is beginning, that'll be the rush before all the best plants are sold.

That's the funniest comment I have ever seen.