On elevated or sunken roadways with insufficient outside shoulder, it may be an impossible job for a single sensor. Two RTMS Echo units, configured as shown below will cover all lanes if detection zones are defined as shown below.
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 25 ft (8 m), to avoid the strong reflection from the side of the structure.
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