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Road condition (METRo)

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Code Edit

In the road forecast file, the value of road contidion (<rc>) means the following:

Description METRo value NTCIP code equivalent SSI code equivalent Lufft IRS21 Code equivalent
Road condition
Dry road 1 3 33 0
Wet road 2 4,5,6 34,36,39,41,42 1,2
Ice/snow on the road 3 7,8,9,10 35,37,38 3,4
Mix water/snow on the road 4
Warning
Dew 5 12
Melting snow 6
Frost 7 13 40,43
Icing rain 8

Interpretation Edit

Road condition Edit

Dry road (1)Edit

Each reservoirs (water and ice/snow) contains less than 0.2 mm of liquid water equivalent.

Wet road (2) Edit

The water reservoir contains more than 0.2 mm of water.

Ice/snow on the road (3) Edit

The ice/snow reservoir contains more than 0.2 mm of water equivalent.

Mix water/snow (4) Edit

Both of the reservoirs (water and ice/snow) contains more than 0.2 mm of water equivalent.

Warning Edit

Dew (5) Edit

Condensation on the road when the temperature of the surface of the road is above the freezing point.

Melting snow (6) Edit

Solid precipitation on the road when the temperature of the surface of the road is above the freezing point.

Frost (7)Edit

Condensation on the road when the temperature of the surface of the road is under the freezing point or water already present on the road turning into ice.

Icing rain (8) Edit

Liquid precipitation on the road when the temperature of the surface of the road is under the freezing point.


Criteria for determination of the road condition Edit

For every timestep (currently 30 seconds), METRo determines the road condition based on the table at the bottom of the page. For every period (currently 20 minutes) of the road forecast of METRo, the maximum value reached during this period is used to designate it.

As example, if the values for the 20 minutes are:

[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 5, 1, 1, 1, 
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]

the value 5 will designate this period.

Note: The threshold value used in the table have the value 0.2 mm in the case of the liquid reservoir and 0.2 cm in the case of the snow/ice reservoir.


Criteria Value METRo code
Water and snow/ice reservoirs contains less than their threshold and there is no condensation Dry road 1
Water reservoir contains more than the threshold Wet road 2
Snow/ice reservoir contains more than the threshold Ice/snow 3
Water and snow/ice reservoirs contains more than the thresholds Mix water/snow 4
Water and snow/ice reservoirs contains less than the thresholds, presence of liquid condensation and no rain Dew 5
Presence of snow precipitation when the temperature of the surface of the road is above the freezing point Melting snow 6
Water and snow/ice reservoirs contains less than the thresholds, presence of solid condensation or there is transfer from water reservoir to the snow/ice reservoir Black ice 7
Presence of rain and the temperature of the surface of the road is below the freezing point Icing rain 8


METRo I/O files
Station | Observation | Forecast | Roadcast | Configuration
METRo I/O specification
Schema | | Flowchart | Format | Date | Observation QA/QC | Road condition | Station type | Time zone | Layer type | Latitude and longitude
METRo I/O examples
Station | Observation | Forecast | Roadcast | Graphical display


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This page is part of the documentation of the METRo software. Back to the table of content.

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