The sign indicating the "End of the prohibition on overtaking single-track vehicles for multi-track motor vehicles and motorcycles with sidecars" signals that vehicles such as cars and motorcycles with sidecars may now overtake single-track vehicles (typically bicycles and motorcycles without sidecars) after this point.

This means that prior to this sign, there was a restriction on overtaking these types of vehicles, likely due to safety concerns or road conditions. Once you see this sign, it is safe and permissible to overtake them.

It's important to exercise caution and ensure that it is safe to overtake, as well as to follow any other relevant traffic laws when doing so. Always check your blind spots and be mindful of other road users.