The "Know Your Vehicle Application Status" service in Bihar helps applicants track the progress of their vehicle-related applications submitted through the Vahan portal. By entering details such as application number or registration details, users can instantly view updates on pending approvals, verification, or issuance of documents. This service enhances transparency, reduces the need for repeated visits to RTOs, and ensures applicants remain informed about their vehicle-related processes, making the entire system more efficient and user-friendly.