

This is quite surprising, especially as we often don’t think of bananas, or even wet mud, as great conductors. However, the tester surmised that introducing the materials into the circuit is just like adding a resistor in series, and they’re unlikely to distort the audio too much, except by lowering the signal level.
I see you also read the article



It always bothers me that red houses only ever want to go to red buildings and that you can just leave a lot of the houses completely unconnected to the road system you built. But making a slightly more realistic traffic simulator would probably be a lot more complicated and a lot less fun.