Are motorways rational from slime mould's point of view?

Andrew Adamatzky^*, Selim Akl, Ramon Alonso-Sanz, Wesley Van Dessel, Zuwairie Ibrahim, Andrew Ilachinski, Jeff Jones, Anne V D M Kayem, Genaro J. Martínez, Pedro De Oliveira, Mikhail Prokopenko, Theresa Schubert, Peter Sloot, Emanuele Strano, Xin She Yang