Maths Problem: Connect the towns solution (Motorway Problem)

What is the minimum amount of road needed to connect these four towns together? Known as the Motorway Problem or Steiner Problem. An experimental solution. With thanks to Scott Grandison of the University of East Anglia for all his help! And David and Neil of the workshop for making the props! Reference: Problem solving with soap films: Part I, C Isenberg 1975 Phys. Educ. 10 452 More information from wikipedia: If you liked this, you’ll also like “Slime Mold Grows Network Just Like Tokyo Rail System“