CHAPTER 1 INSTALLING THE SMARTSENSOR ADVANCE 17
Figure 1.2 – Attaching the Sensor to the Mount Bracket
Aligning the Sensor to the Roadway
In most applications, the goal is to position the beam’s elliptical footprint along the road-
way. is is done by pointing the hot spot of the sensor’s beam (middle of the sensor) at a
target location, and then rolling the sensor so that the beam’s footprint lines up with the
road.
e standard sensor mount has three axes of rotation: straps around pole, vertical and hori-
zontal swivel points. Make sure that your sensor mount’s degrees of freedom are adjustable
until you have completed your alignment.
Follow the steps below to correctly align the sensor:
1 Point the sensor towards the target on the road by tilting the sensor down and pan-
ning it to the left or right as necessary (see Figure 1.3). e target location is typically
between 30 and 80 ft. (9.1 and 24.4 m) upstream from the sensor in the center of the
lanes of interest. See Table 1.1 below to nd the appropriate target distance.
Height (ft / m)
Oset (ft / m)
17 / 5.2 20 / 6.1 25 / 7.6 30 / 9.1 35 / 10.7 40 / 12.2
0 / 0 40 / 12.2 45 / 13.7 55 / 16.8 60 / 18.3 70 / 21.3 75 / 22.9
5 / 1.5 45 / 13.7 45 / 13.7 60 / 18.3 65 / 19.8 70 / 21.3 80 / 24.4
10 / 3 50 / 15.2 50 / 15.2 60 / 18.3 65 / 19.8 75 / 22.9 80 / 24.4
15 / 4.6 50 / 15.2 55 / 16.8 65 / 19.8 70 / 21.3 75 / 22.9 80 / 24.4
20 / 6.1 55 / 16.8 55 / 16.8 65 / 19.8 75 / 22.9 80 / 24.4 90 / 2 7.4
25 / 7.6 60 / 18.3 65 / 19.8 65 / 19.8 75 / 22.9 80 / 24.4 90 / 2 7.4
30 / 9.1 65 / 19.8 70 / 21.3 75 / 22.9 80 / 24.4 85 / 25.9 95 / 28.9
35 / 10.7 70 / 21.3 75 / 22.9 85 / 25.9 85 / 25.9 95 / 28.9 95 / 28.9
40 / 12.2 80 / 24.4 90 / 2 7.4 90 / 2 7.4 95 / 28.9 95 / 28.9 100 / 30.4
45 / 13.7 95 / 28.9 100 / 30.4 100 / 30.4 100 / 30.4 100 / 30.4 105 / 32
50 / 15.2 100 / 30.4 100 / 30.4 105 / 32 110 / 33.5 115 / 35 120 / 36.6
Table 1.1 – Target Distance (ft / m)
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