The traffic sign "Marking requirement" for vehicles carrying hazardous goods without an arrow symbol indicates that vehicles transporting dangerous goods must have specific markings on them. This sign is important for safety and awareness; it helps identify vehicles that could potentially pose a risk due to the materials they are carrying.

According to German traffic regulations, vehicles that transport hazardous goods must display a label that matches the class of the hazardous material they are carrying. The absence of an arrow symbol suggests that while there is a requirement for marking, the regulations regarding directionality or specific routing may not apply.

It's essential for all road users to be aware of these markings to ensure safety in situations where such vehicles are present. Always exercise caution and maintain a safe distance when driving near vehicles carrying hazardous goods. If you have any further questions about this sign or related rules, feel free to ask!