Federal Office of Meteorology and Climatology MeteoSwiss

Slippery roads


Level 2 (yellow) Level 2 (yellow)
Snowfall (lowlands):
> 1 cm, 2 cm, 5 cm, 10 cm
Snowfall (mountains):
> 20 cm, 30 cm
Danger of icy roads, black ice, snow crusts
Snow drifts:
> 75 km/h
Possible consequences
  • Slippery surface due to packed snow, black ice or freezing rain.
  • Low visibility conditions due to blowing or drifting snow.

Recommendations (The instructions of the authorities are to be followed at any rate!)
  • Observe the local weather development, get yourself informed and adapt your behaviour to the present conditions
  • Inform yourself on traffic conditions (Radio, Phone Number 163).
Level 3 (orange) Level 3 (orange)
Freezing rain:
1 mm
Possible consequences
  • Sudden, acute danger of skidding due to icy roads.
  • Traffic routes impassable as a result of icy conditions.
  • Air traffic obstructed.
  • Branches breaking under the weight of the ice.

Recommendations (The instructions of the authorities are to be followed at any rate!)
  • Observe the local weather development, get yourself informed and adapt your behaviour to the present conditions
  • Inform yourself on traffic conditions (Radio, Phone Number 163).
  • Do not take unnecessary drives, not even with winter equipment.
  • In case of indispensable journeys, use public transport.
  • Heavy vehicles: Use the escape roads at hand.
  • In case of traffic jam, build lane to let clearance vehicle pass.
  • When leaving your vehicle, leave the ignition key.
  • Remove any vehicles hindering road clearance.
  • Do not make unnecessary phone calls (network failure).
Level 4 (red) Level 4 (red)
Freezing rain:
2 mm
Possible consequences
  • Sudden, acute danger of skidding due to icy roads.
  • Complete standstill of road and air traffic.
  • Rail traffic obstructed.
  • The weight of the ice can cause branches to break or trees to fall.
  • Electricity supply interrupted and telephone lines cut off, especially in areas not easily accessible.

Recommendations (The instructions of the authorities are to be followed at any rate!)
  • Observe the local weather development, get yourself informed and adapt your behaviour to the present conditions
  • Inform yourself on traffic conditions (Radio, Phone Number 163).
  • Do not leave your houses and apartments unless necessary.
  • If you are en-route: In case of traffic jam, build a lane to let clearance vehicles pass.
  • Heavy vehicles: Use the escape roads at hand.
  • When leaving your vehicle, leave the ignition key.
  • Remove any vehicles hindering road clearance.
  • Do not make unnecessary phone calls (network failure).
Level 5 (dark red) Level 5 (dark red)
Freezing rain:
> 5 mm
Possible consequences
  • Sudden, acute danger of skidding due to icy roads.
  • Complete standstill of road and air traffic.
  • Rail traffic severely obstructed.
  • The weight of the ice can cause branches to break or trees to fall.
  • Failure of electricity supply and telephone lines.

Recommendations (The instructions of the authorities are to be followed at any rate!)
  • Observe the local weather development, get yourself informed and adapt your behaviour to the present conditions
  • Inform yourself on traffic conditions (Radio, Phone Number 163).
  • Do not leave your houses and apartments.
  • If you are en-route: In case of traffic jam, build a lane to let clearance vehicles pass.
  • Heavy vehicles: Use the escape roads at hand.
  • When leaving your vehicle, leave the ignition key.
  • Remove any vehicles hindering road clearance.
  • Do not make unnecessary phone calls (network failure).
  • Do not touch any electric lines lying on the floor.
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