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Finally, Radar Group allocation to a carriageway can effect the range of a radar. In the example below, which is within a tunnel with two bores, there are two Radar Groups; one for each of the single carriageways; one travelling eastwards, and the other westwards. Using two different radar groups, the eastwards radar will not report back any data from the westward carriageway and vice-versa:
Add config too
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Allocation
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The implications for a radar failure are slightly different for coverage and section allocation. - you would still get stats but get duplication of stats.
Section to Radar Allocation
Your allocation images can be used to explain how section - radar allocation works
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Here is the map showing a carriageway with a healthy carriageway coverage status for a section.
The Normal Coverage and Current Coverage of the radar for the selected section 19 (which is well within the range of the radar) is showing 100%, and the Coverage and Statistics Status are both showing as healthy:
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Peripheral Coverage
When sections of the carriageway are situated towards the edge of the radar range, then the coverage may be reduced. Section 15 is near the edge of the radar boundary, and it shows a Normal and Current Coverage of 99.3%99%:
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Coverage Out Of Range
Section 14 is just over the boundary of the radar range and so the normal and current coverage is greatly reduced - both at 0.9%1%:
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Section 13 is out of range of the radar, and therefore not allocated to it. It is therefore expected that the normal and current coverage are at 0.0%.
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There are other reasons why coverage is not as high as you’d expect; in this scenario, an exclusion area, highlighted in yellow, has been placed within halfway of Section 1926, and this excludes any radar data returning from this area, so the Normal and Current Coverage are is at 47.4%78%:
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Unhealthy Radar
If the radar status is unhealthy then the radar coverage falls; in the example below it is expected to be at 100% but the Current Coverage is showing as 0.0%:
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Unavailable Radar
If a radar develops a fault or goes offline then the coverage and allocation statuses can change. The following can have an impact…reduce opacity of map…
In addition, the carriageway where the radar is unhealthy, is highlighted in red dashed lines as above.
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