Cf moto USA said:
We have our machines in 70 countries around the world, and there are different legality standards in each one--in countries that require turn signals and parking lights, the third position allows the machine to run these lights.
If you look at the wiring of our machines, all of them are already wired to accept turn signals as a result of this, but importation, licensing, and taxes are different (and more expensive) for vehicles that are set up for on-road use, so our US machines come without these features installed. This is the same reason the UForce line has a turn signal lever just like a car even though it doesn't have turn signals.