Chapter 1: Choosing a Mounting Location
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Mounting on the near side of the approach
Figure 8.
Near side of the approach
˿
Gives you more flexibility with mounting height than mounting
on the mast arm.
˿
If the mast arm or signal head is occluding the sensor’s view,
this may be the best location.
Choosing a mounting height and offset
In general, the sensor should be mounted 20 ft. ± 5 ft.
(6.1 m ± 1.5 m) above the surface of the road. If mounting on a mast
arm or other location where the height cannot be changed signifi-
cantly, use the table below to choose an offset. If mounting on a
vertical pole, where the offset cannot be changed significantly, use
the table to choose a mounting height.
Offset
Height
6–15 ft
12–25 ft
15–50 ft
15–25 ft
> 50 ft
25–60 ft
Definition.
Mounting
height is the distance
between the sensor
and the road’s
height, not the
bottom of the pole. If
installing a new pole,
remember that part
of the pole will likely
be below ground.
Definition.
Offset is
the distance between
the sensor and the
edge of the first lane
to be detected.
