We’re really not stuck for space, we’re just bad at slicing it up.
I was looking at a huge junction in London recently and was wondering if you could fit a full-sized football pitch in the space. (After all, it’s a measurement people seem to understand.)
It turns out, you quite often can (or very nearly). I superimposed an aerial shot of a major football team’s pitch onto various road junctions around the UK to see how much space was really available. Then I made them look nice and uploaded them here for your perusal.
If you’re not familiar with the scale here, have a look at these photos to get an idea of just how big this football pitch is.

Parliament Square, London. I find it amazing that you could fit TWO full-sized football pitches in here!

Holborn Circus, London. A notoriously dangerous junction which is currently undergoing redevelopment (though the redesign looks pretty crap to me).

Junction of Euston Road and Tottenham Court Road, London. Still called Euston Circus despite being bulldozed through in the 1960s or 70s, this area is currently subject to road-works where the car will remain king.

Tollcross, Edinburgh. A junction which I hate, it’s some sort of 1960s town planner’s dream scheme. Awful to walk across, takes ages waiting at the many arms of this junction. I’ve never cycled there but I can’t imagine it’s much fun.

Kirkstall Road and Willow Road, Leeds. Recently remodelled, this area offers “provision for cyclists to use the new bus lane and enjoy a safer and easier ride“, as if that’s going to get people cycling. Duuuhhh, try again, Leeds City Council!

Hyde Park Corner, London. I know the island takes up much of this, but the fact that you can easily fit THREE full-sized football pitches in the area tells us that there’s literally room for improvement here.
And a new, late addition:
Do you have any more suggestions of wide roads and junctions to try this on? Let me know in the comments and I might do a follow-up.
All satellite images from Google Maps.