Correction - The video is from a Germany team. And they graciously share the following programming / design trick with others:
Halljac (1 week ago)
... how do you get the robot to follow the black line so smoothly? robodream (1 week ago)
--- We follow the line with one light sensor on the "inside" of the bend. Outside motor running all the time, inside motor full powerlevel when seeing white, backwards 20% powerlevel when seeing black. We get the speed by putting the big gearwheel on the NXT Servomotor and the medium gearwheel on the chain shaft.
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