Inquiring about relevant information shows that the expiration of the B certificate of Lhasa Jiaoan Highway needs to be postponed, and it is necessary to contact the issuing authority to participate in continuing education. Highway traffic safety certificate B expires, you can contact the issuing authority, usually the local construction department or the construction Committee to organize the implementation of continuing education. After continuing education is qualified, you can apply to extend the use period of the certificate. Usually, continuing education is very simple. After studying for 2-3 days, the exam is coming. After passing the examination, you can stamp the certificate and extend the time.