A "cloverleaf" interchange scoring an efficiency of 439. This interchange is used in real life, so it makes sense that it scores well in-game.

A strangely-designed interchange. The long bridges make it expensive, with traffic already forming on the green exit. This design's not the best!

An interchange with a lot of intersections. This type of interchange is highly economical, but often has poor traffic flow.

An extremely peculiar interchange. Tight angles should be avoided, as should long bridges. This interchange has some quirks, but it looks cool!

An interchange with a roundabout. The roundabout diverts traffic away from the central interchange, improving efficiency while looking incredible!

The logo for Freeways. The interchange featured is that between the 405 and 118 freeways in Los Angeles, very local to me! Note the loops, ramps, and the fact the interchange in the middle of a neighborhood.