splined roads for boats

[xpupx]

Has anyone noticed that you can lay a generic splined road in the water and get a boat to follow it?
Sadly there are no scripts for boats as for cars to make them follow the road infinitely, an oversight perhaps?
If this could work in the same way as splined roads but for boats and ships, it would add a new depth of realism to ports in game as you could have local traffic skimming about the ports.