http://www.discovere.org/sites/default/files/Designing%20Highway%20Interchanges_111516.pdf
Design challenge:
Quote
Design a highway interchange that allows drivers to approach from any highway and leave by any highway without crossing any lanes of traffic.
Materials are foam core, rope, paper clips, glue, paper. It's a 30-minute activity, so not a deep dive, but it looks like something a lot of us have done on our own for fun.
The project is tied to a 2017 IMAX film titled "Dream Big" that "celebrates the human ingenuity behind engineering marvels big and small, and reveals the heart that drives engineers to create better lives for people around the world."