The sign "End of the overtaking ban for motor vehicles over 3.5 tons" indicates that the previous restriction on overtaking for vehicles exceeding 3.5 tons is no longer in effect. Motor vehicles that weigh more than 3.5 tons, such as large trucks and buses, are allowed to overtake other vehicles on the road once they see this sign.

This sign is important because it informs drivers of heavy vehicles that they can proceed with overtaking, which can improve traffic flow. However, it is still crucial for all drivers to exercise caution, ensure it's safe to overtake, and follow other traffic regulations related to overtaking.

If you have more questions or need further explanation about related traffic rules, feel free to ask!