Whirlpool 17 February 2017
Free-flowing, resizeable and also quite pretty.
Three-Level Stacked Roundabout 17 February 2017
A cheap and cheerful way to fully grade separate two intersecting roads.
Partially Unrolled Cloverleaf 17 February 2017
A clever improvement on the cloverleaf.
Four Level Stack 17 February 2017
It is big, and it is clever.
Cloverleaf 15 February 2017
Four symmetrical loops — it's impossible to miss a cloverleaf. If you can find one, that is.
Trumpet 15 February 2017
The simplest free-flowing three-way connector.
Triangle 14 February 2017
Three levels of road, three roads connected, three ways to build it.
Roundabout Interchange 14 February 2017
The true British interchange.
LILO 14 February 2017
A junction with no bridges and not much choice if you're on the side road.
Dumbbell 14 February 2017
Halfway between a diamond and a roundabout interchange.
Diamond 14 February 2017
A conventional, basic motorway-to-road connection.
Fork 19 January 2017
It might be the simplest type of interchange there is. One way on and one way off: a fork in the road.