The lead Weasel had two oblique mirrors, one in front of the driver facing upwards and the other positioned above the first and facing downwards and backwards. By keeping a bead on the following vehicles and the bamboo guide posts left at two and a half mile intervals, it was found the vehicles could keep a very straight path.
The lead Weasel employed two angled reflective elements, one in front of the driver facing upwards and the other positioned above the first, reflecting downwards and backwards. By monitoring the following vehicles and bamboo markers spaced at regular intervals, it was found that the vehicles could keep a remarkably straight path.