What does the "HL" marking mean?

The sharp increase in the number of electric vehicles on the roads is impressive. Electric vehicles have fundamentally different characteristics, and they can't be called cars in our classical sense. Of course, with the advantages, there are also a number of disadvantages, one of which is the significant weight. The significant weight has a huge impact on tire wear. With tires for electric vehicles, everything is perfectly clear. If a tire is marked as a tire for electric vehicles, it means it is adapted for high loads. But what about tires that do not have any markings indicating adaptation for electric vehicles?

Now such labeling exists. At least it indicates that the tire is ready for high loads. The "HL" (High Load) marking has a higher carrying capacity than tires made to the previous XL standard. For example, "HL 245/40 R 19 101 Y XL". The carrying capacity of this HL tire is 825 kg (load index 101), which is 10% higher than the usual XL standard of 750 kg (load index 98). Passenger tires of this size, made to the SL (Standard Load) standard, are suitable for many cars, up to mid-range models, and can withstand a maximum load of 670 kg (load index 94).
Increasing the carrying capacity while meeting customer requirements required a number of changes both in the tire structure and in the rubber compound.

Note that the HL marking itself only indicates that the speed index is higher than that of a standard tire and even higher than that of an XL tire.