#253: Highway Engineer Pranks explain

[Each panel depicts a highway intersection.]

The Inescapable Cloverleaf:

[Roads lead onto the rings for each leaf, but then are trapped in the circles. Minor roads also allow travel between the rings.]

The Zero-Choice Interchange:

[On- and off-ramps exist, but they lead back to the same lane they disconnected from.]

The Rotary Supercollider:

[The roads lead into a traffic circle, and then a loop reverses the direction of flow so all the roads run into each other.]