Chapter 2: Pre-Installation Considerations
RTMS Echo User Guide ©2019 Image Sensing Systems Inc. 2-15
Grade Differentials
When grade differences are small, a single unit on the high side may work,
provided all lanes are within range.
Figure 2-15: Small Grade Differentials
When the grade differential is large enough to put a part of the lower level in a
“shadow”, two RTMS Echo units are required as shown by the following.
Figure 2-16: Large Grade Differential
Trees
Trees and bushes in the path of the microwave beam (in the setback or in
medians) must be avoided. RTMS Echo units must be relocated or a gap in
vegetation maintained in the path of the beam.
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