The sign you mentioned is known as "Notice of changed right of way, traffic guidance or special traffic regulations" (1008-31). This sign is used to inform drivers that there has been a change in the traffic regulations at the location. It may indicate altered traffic rules, such as new right-of-way priorities, detours, or special traffic conditions that must be observed.

When you see this sign, it is essential to pay close attention to the information presented and follow any new directives or rules that apply. Failing to comply with these regulations can lead to traffic violations and potential safety hazards.

Always ensure to assess the surrounding situation carefully and adhere to any instructions or changes indicated by the sign for safer driving. If you have more questions about traffic rules or need further clarification, feel free to ask!