The sign you're referring to is known as "Special Vehicles and Transport Goods Free" (sign 1026-39). This sign indicates that certain special vehicles and transport of goods are exempt from restrictions that may be in place on that road or in that area.

Typically, this sign is used in situations where other rules, such as weight limits or restrictions for certain vehicles, might apply. It allows specified vehicles, such as those used for transporting goods or designated services (like construction or emergency vehicles), to operate freely, bypassing the usual limitations.

It's important for drivers to pay attention to these signs to understand if they are subject to any additional regulations or if they can continue without concern of restrictions. Always ensure that you are in compliance with local driving laws and regulations when encountering such signs.