Roktrack makes a turn as it approaches one pylon and searches for the new next pylon. While it should preferably turn continuously and without interruption, in practice it repeats the cycle of "turn for 500 ms, shoot, infer". This is because shooting while turning will result in a blurry image as shown in the image below. 

On the other hand, images taken while moving forward on the target object are not terribly blurry.

If you are building a robot with a cheapo webcam, the turning should be intermittent and awkwardly controlled.