User's Guide

Chapter 2: Pre-Installation Considerations
RTMS Echo User Guide ©2019 Image Sensing Systems Inc. 2-13
Elevated Roadway
On elevated or sunken roadways with insufficient outside shoulders, it may be
an impossible job for a single sensor. Two RTMS Echo units, configured as
shown by Figure 2-12
, will cover all lanes if detection zones are defined as
shown in Figure 2-12
.
Figure 2-12: RTMS Echo on Elevated Roadway
RTMS Echo can also monitor elevated highways from tall poles erected on the
lower level. However, in this case the setback should be less than 8 m (26 ft),
to avoid the strong reflection from the side of the structure.
Figure 2-13: Pole Location for an Elevated Roadway