I recall when the guys at PopTop were developing the original Tropico they had wanted to incorporate some form of road vehicles. ... Given Tropico 2 is based on the same engine, ...
I'm not sure that is true. I think somewhere "Frog City" said they used one of their engines rather than the modified RRT2 engine.
In any case, I'm sure that one of them posted here that the game will run even without roads because there is a movement "default" that activates teletransport
if the walking animation is blocked.