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Chapter 2:
Placement in Side-Fired Highway Configuration
RTMS Sx-300 User Guide
©2014 Image Sensing Systems Inc.
2-10
Sunken Road and Roadside Walls
When vertical surfaces reflecting microwaves (e.g., dense chain link fences or
retaining walls of a sunken roadway) are present, multi-path reflections from large
vehicles in close lanes cause additional false (ghost) detection in farther detection
zones.
retaining walls of a sunken roadway) are present, multi-path reflections from large
vehicles in close lanes cause additional false (ghost) detection in farther detection
zones.
Figure 2-10: False Target Generated by Fence Or Wall
To avoid this problem install the Autoscope RTMS Sx-300 higher and increase the
elevation angle to detect the far lanes of traffic excluding the nearest lanes, as shown
on the right in
elevation angle to detect the far lanes of traffic excluding the nearest lanes, as shown
on the right in
Installing Autoscope RTMS Sx-300 on Sign Structures
The installation of the Autoscope RTMS Sx-300 on Message Sign structures is
acceptable only if the Autoscope RTMS Sx-300 is mounted to be offset from the
overhead span of the structure. Structures can reflect the microwave signal and distort
the accuracy of detection. Some structures such as DMS units have very wide, flat
metal bottoms to the structure that are similar in nature to bridges, these type can
cause more interference than other lattice work type structures and may require
consultation with Autoscope RTMS Sx-300 Technical Support.
acceptable only if the Autoscope RTMS Sx-300 is mounted to be offset from the
overhead span of the structure. Structures can reflect the microwave signal and distort
the accuracy of detection. Some structures such as DMS units have very wide, flat
metal bottoms to the structure that are similar in nature to bridges, these type can
cause more interference than other lattice work type structures and may require
consultation with Autoscope RTMS Sx-300 Technical Support.
The best way to mount the Autoscope RTMS Sx-300 is to place a horizontal mast arm
or pipe approximately 1.3 m (4 ft) away from the structure (1.8-2.4 m [6-8 ft] if
DMS), ideally on the back of the structure away from any lighting or signs. Ensure the
detector is aimed perpendicular to the traffic flow.
or pipe approximately 1.3 m (4 ft) away from the structure (1.8-2.4 m [6-8 ft] if
DMS), ideally on the back of the structure away from any lighting or signs. Ensure the
detector is aimed perpendicular to the traffic flow.
Figure 2-11: Autoscope RTMS Sx-300 on Sign Structures