Wow, it seems like you can do it with a simple DC circuit too! That paper's a bit complicated but if you just make the road network with constant voltage drop d

Wow, it seems like you can do it with a simple DC circuit too! That paper's a bit complicated but if you just make the road network with constant voltage drop diodes and resistors instead of constant travel time roads and time-proportional-to-traffic roads respectively, it looks like adding a link actually increases the voltage drop across the overall circuit for a constant current!!