Pre-Installation Considerations: RTMS Echo Sensor

Sign Structures

The installation of the RTMS Echo on Message Sign structures is acceptable only if the RTMS Echo 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 types can cause more interference than other lattice work type structures and may require consultation with RTMS Echo Technical support. The best way to mount the RTMS Echo is to place a horizontal mast arm or pipe approximately 4 ft (1.3 m) away from the structure (6-8 ft [1.8-2.4 m] 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.

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