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I have seen this sign mounted on the backs of some cars. But I could not find any information about it.

The upper end of the black part is spiky.


Given that very similar sign is employed in Russia, I would theorise it means that this car has little spikes built in its wheels' tyres, facing outwards. Spikes allow car to come to halt much faster in snowy weather, which may be of surprise for drivers of non-equipped cars.

шипованная резина

Spikes also supposedly damage roads' asphalt layer.

Please see a page describing this sign (in Russian).

The message descibes the season range when such tyres are allowed (1 Nov - 1 Apr), as well as features the sign itself.

  • 2
    You are right, but I still find the requirement or explanation a little bit odd. I regulary drive in many other European countries where studded tires are common and it is in other countries not common that cars with studded tires are required to carry a warning sign. No matter what stickers the car in front of you has on its back, you must expect it to be able to break more efficiently than you and keep distance. Dec 6 '19 at 10:43
  • 2
    @Tor-EinarJarnbjo this expectation generally fails the more east you move. Just look for news for big collisions and the number of cars involved. The more easter, the more the numbers. Dec 6 '19 at 11:30
  • 5
    @Tor-EinarJarnbjo shrug. Why do we have L plates, when you're already best off assuming everybody else on the road i̶s̶ ̶a̶n̶ ̶i̶d̶i̶o̶t can't drive? Dec 6 '19 at 18:06
  • 2
    @LightnessRaceswithMonica Why do you ask me? When I learned to drive, there were no L plates either. In between, there are however so many warning signs pointing out even the most obvious and/or theoretical danger, that if a real danger should actually arise, you'll probably miss it, since you are busy reading the warning signs. Dec 6 '19 at 18:39
  • 4
    @FreeMan And it is a skill, which most regular drivers don't master at all, at least not under preasure in an emergency situation, hence ABS will also reduce stopping distance on most surfaces for most drivers. The ABC 'cycle' you describe does on average give better grip and break force than trying to stop with locked wheels. When learning to drive, at a time when ABS was not common on all cars, we were taught cadence breaking as part of winter practice, a manual approach to the ABS cycle achieved by 'pumping' the break pedal as fast as possible instead of just stepping on it. Dec 6 '19 at 21:03

I can confirm that in Lithuania these are are used in the same way as alamar described.

See point 5 here: https://www.keliueismotaisykles.info/transporto-priemoniu-skiriamieji-ir-informaciniai-zenklai-transporto-priemonese.html (in Lithuanian). This is the official site for traffic regulations in Lithuania. It states the needed size for the sign, as well as that any car with spikes on the tires is required to have this sign on the back of the car.

  • Thank you for the source. I will use it for further questions of mine about car driving :) Dec 6 '19 at 21:53
  • 1
    the sign looks like "beware of tacks on the road", it may be worth knowing that other European countries use different pictograms for the same purpose, for example de.wikipedia.org/wiki/Datei:Spike-aufkleber.svg
    – dlatikay
    Dec 7 '19 at 17:26

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