The sign you are referring to is known as the Diagonal cross with lightning arrow. This sign indicates that you are approaching a section of the road that is particularly dangerous due to a potential electrical hazard.

When you see this traffic sign, it warns you to drive with caution as there may be overhead electrical lines or other electrical infrastructure that could pose a risk, especially during adverse weather conditions or in certain areas where vehicles might come into contact with such hazards.

Always be vigilant and adjust your speed when you see this sign, as it is critical for your safety and the safety of others on the road. If you have any further questions about specific driving rules or other traffic signs, feel free to ask!