8
Figure 6: detection precision in function of offset (O) and width of bicycle path (W) for an installation height (H) of 2 m
The detector beam needs to point towards the head or the body of the cyclists, not the legs. Therefore, when placing the
detector higher, the light beam of the detector needs to be directed towards the ground at a larger angle. The angle and
therefore the maximum distance of detection is therefore a function of the height of the installation, the Offset (O) and the
Width (W) of the bicycle path.
The maximum detection Distance D as shown in Figure 4 is 4 m. At an Offset value of zero meter, the maximum width of the
bicycle path is equal to 4 meters, which is in such particular case equal to the maximum Distance D.
Assuming that the minimum height of the saddle is 1m and that the minimum height of the cyclists’ heads is 1.6m, the
maximum Width W of the bicycle path with Offset zero is 1.25 m as shown in Figure 6 for an installation height at 2m.
For an installation height at 2.5m, the maximum Width W of the bicycle path with Offset zero is 0.35 m as shown in Figure 7.
For an installation height at 1.4 m, the maximum Width W of the bicycle path with Offset zero is 4 m as shown in Figure 8.
