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Conditions - Weather

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Weather is a STATS19 field which indicates the conditions at the time and location of a crash. it is represented by a MAST dimension.

Contents

In STATS19

  • Fine without high winds means any weather condition which does not have an adverse effect on driving, so no adverse conditions of any kind applied
  • Raining includes drizzle, hail and sleet not tending to build up a deposit.
  • Snowing includes sleet building up a deposit.
  • Fog does not include light mists which did not constitute a driving hazard on the road where the crash occurred.
  • The combinations of certain conditions with high winds are only used if the winds are deemed to have adversely affected driving conditions for one or more of the vehicles in the crash. This does not imply that the high winds were a cause of the crash.
  • If two or more condition types could be appropriate, the condition which is deemed to have most adversely affected driving conditions is entered.
  • Other can be used to indicate any other adverse weather condition which is not separately specified, and this should be avoided if at all possible.

In MAST

Weather is available as a dimension in MAST reports. This dimension contains three alternative hierarchies, representing different possible approaches to grouping the STATS19 data. Users should consider which hierarchy is most appropriate for each report, based on the meaning of the highest levels as defined below.

Weather_Windy hierarchy

This is the default hierarchy which is used when the Conditions - Weather dimension is added as a report category, series or filter without a specific hierarchy being selected.

Calm no winds present which could have adversely affected driving conditions for any involved vehicle

  • FineStill
  • WetStill
    • RainStill
    • SnowStill
  • FogMist

Wind winds were present which could have adversely affected driving conditions for any involved vehicle

  • FineWindy
  • WetWind
    • RainWindy
    • SnowWindy


Weather_Adverse hierarchy

Good weather had no adverse effect on driving

Bad any weather which could have an adverse effect on driving

  • WetStill
    • RainStill
    • SnowStill
  • FineWindy
  • WetWind
    • RainWindy
    • SnowWindy
  • FogMist

Weather_Wet hierarchy

Dry there was no no rain, drizzle, hail, sleet, snow, fog or mist consituting a driving hazard

  • FineStill
  • FineWindy

Wet rain drizzle, hail, sleet, snow, fog and/or mist consituting a driving hazard was present

  • WetStill
    • RainStill
    • SnowStill
  • WetWind
    • RainWindy
    • SnowWindy
  • FogMist
Retrieved from "https://wiki.roadsafetyanalysis.org/wiki/index.php?title=Conditions_-_Weather"
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